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Assessment of prenatal exposure to tobacco smoke by cotinine in cord blood for the evaluation of smoking control policies in Spain

Abstract

Background

Over the last few years a decreasing trend in smoking has occurred not only in the general population but also during pregnancy. Several countries have implemented laws requiring all enclosed workplace and public places to be free of second hand smoke (SHS). In Spain, legislation to reduce SHS was implemented in 2005. The present study examines the possible effect of this legislation on prenatal SHS exposure.

Methods

Mothers and newborns were recruited from 3 independent studies performed in Hospital del Mar (Barcelona) and approved by the local Ethics Committee: 415 participated in a study in 1996-1998, 283 in 2002-2004 and 207 in 2008. A standard questionnaire, including neonatal and sociodemographic variables,tobacco use and exposure during pregnancy, was completed at delivery for all the participants in the three study groups. Fetal exposure to tobacco was studied by measuring cotinine in cord blood by radioimmunoassay (RIA).

Results

32.8% of the pregnant women reported to smoke during pregnancy in 1996-1998, 25.9% in 2002-2004 and 34.1% in 2008. In the most recent group, the percentage of no prenatal SHS exposure (cord blood cotinine 0.2-1 ng/mL) showed an increase compared to the previous groups while the percentages of both: low (1.1-14 ng/mL) and very high (> 100 ng/mL) prenatal SHS exposure showed a decrease.

Discussion

The results of the three study periods (1996-2008) demonstrated a significant increase in the percentage of newborns free from SHS exposure and a decrease in the percentage of newborns exposed to SHS during pregnancy, especially at the very high levels of exposure. A significant maternal smoking habit was noted in this geographical area with particular emphasis on immigrant pregnant smoking women.

Conclusions

Our study indicates that there is a significant maternal smoking habit in this geographical area. Our recommendation is that campaigns against smoking should be directed more specifically towards pregnant women with particular emphasis on non-native pregnant smokers due to the highest prevalence of tobacco consumption in the immigrant women.

Peer Review reports

Background

Exposure to second hand smoke (SHS), active or passive, is considered the single most important cause of avoidable morbidity and early mortality in many industrialized countries [1]. Over the last years, Spain presented a decreasing trend in smoking not only in the general population but also during pregnancy [25]; however it is still an important risk factor for infant health. Most recent population data from Barcelona documented that 28% of pregnant women smoke at the beginning of pregnancy, and although 42% of them quit during the gestational period, 16% smoke throughout pregnancy [5] therefore the gestational and fetal effects of cigarette smoke are of great importance for public health [6]. The effects of tobacco smoke exposure on the health of pregnant women are associated with an increased risk of spontaneous abortion, low birth weight, prematurity, perinatal death and sudden infant death syndrome [79]. while the risk of cognitive problems and neurodevelopment growth [10], childhood cancer [11] and respiratory and allergic symptomatology in the first years of life [12] can be increased as well.

There is scientific evidence that smoke-free environment is the only strategy protecting the population from the negative effects of SHS [13]. For this reason, several countries have implemented legislations requiring all enclosed workplace and public places to be free of SHS [14]. Ireland was the first country with comprehensive smoke-free legislation implemented in 2004. Since then, countries like Norway, New Zealand, Italy, Uruguay, England and many provinces or states in Canada, the USA or Australia [15, 16] followed. Recently, by measuring air nicotine concentrations, a study had shown that exposure to second hand smoke has decreased greatly in indoor public places and workplaces in Uruguay after the implementation of a comprehensive national smoke-free legislation [17].

Spain introduced the legislation to reduce SHS in 2005. The Law 28/2005 includes a health recommendations against smoking and recommendations forregulation of tobacco smoking in public places with wide exemptions in bars, restaurants and night clubs [18, 19]. Furthermore, the implementation of smoke-free legislation generated a continuous discussion topic in the media [20]. After the implementation of the Spanish smoke-free legislation [3, 4, 2123], programs to help smoking pregnant women to quit were implemented (program "Embaràs fum") in Catalonia. These programs included specific training and free nicotine replacement treatment for pregnant smoking women throughout pregnancy [24].

Prenatal tobacco exposure has been usually assessed using self-reported maternal questionnaire [2528]. Difficulties in differentiating passive tobacco exposure from active smoking (such as reluctance to admit active smoking or being unconscious of passive exposure) have prompted the use of specific biomarkers to prevent bias in self-reporting questionnaires [29, 30]. Nicotine and its main metabolite (cotinine) have been used as biomarkers for SHS in conventional (blood and urine) [31, 32] and non-conventional matrices (saliva, meconium and hair) [33, 34]. Cotinine presents a longer biological half-life than nicotine and it is considered the best biochemical marker to differentiate between active and passive tobacco exposure [33, 3537]. Moreover, the levels of cotinine have been found to be directly related to daily cigarette consumption [35]. Cotinine cord blood is the most sensitive and least invasive measure of prenatal SHS in newborns [3642].

The present study examines the possible effects of the actions taken to prevent prenatal SHS exposure. The relationship between the implementation of the law against smoking and a decrease in maternal tobacco use and exposure during pregnancy has been studied by measuring cotinine in cord blood as a reliable biomarker of active and/or passive maternal exposure to SHS. In addition, the relationship between the newborn's cotinine level in cord blood and the parents' smoking pattern declared by questionnaire has been also evaluated.

Methods

Design and subjects

The study was carried out on non selected (general population) mothers and newborns from 3 independent studies conducted at different times in the same setting: Hospital del Mar in Barcelona (Catalonia, Spain

Study 1

415 mothers and their infants were recruited during the period 1996-98, from the Asthma Multicenter Infant Cohort Study (AMICS). The AMICS study was designed to investigate the effects of several pre and postnatal environmental exposures on the inception of atopy and asthma [12, 29, 41, 43].

Study 2

283 mothers and their infants were recruited from 2002 until 2004, before the general implementation of smoke-free workplace policy in Spain in 2005, from the MECONIUM-1 study. The MECONIUM-1 study aimed to estimate the prevalence of using drugs of abuse by pregnant women and the subsequent foetal exposure to illicit drugs by testing the meconium of the newborn [44].

Study 3

207 mothers and their infants were recruited during 2008, after the implementation of smoke-free workplace policy in Spain, from MECONIUM-2 study. The MECONIUM-2 study aimed to estimate the prevalence of alcohol use by pregnant women and the subsequent foetal exposure to alcohol using meconium testing [45].

Informed consent was obtained from parents and all three studies were previously approved by the local Ethics Committee (Comitè d'Ètica i Investigació Clínica, Institut Municipal d'Assistència Sanitària; 2006/2831/I-extension).

Questionnaire information

The same standard questionnaire previously reported in the literature [12, 29, 33, 37, 41] was completed at delivery for all the participants, regardless of the group they belonged to. The questionnaire was always administered by the study interviewer immediately after postpartum and included sociodemographic characteristics (parents' age, parents' birth country, social class defined by parents' occupation using the UK Registrar General's 1990 classification which categorizes people with similar levels of occupational skills). In addition, mothers were asked about their smoking habit and passive exposure to tobacco smoke during pregnancy. If they were smokers, the average number of cigarettes smoked during pregnancy was recorded and the nicotine daily intake (NDI), obtained from the average number of cigarettes smoked per day multiplied by nicotine content (in milligrams) of each cigarette, was calculated. Regarding exposure to SHS, mothers were asked if they were regularly exposed to SHS at home and by whom (nobody smoked, the father or the mother was the only smoker or both smoked). The gender of the newborn was also recorded.

Cotinine in cord blood

Umbilical cord blood was obtained at the time of delivery and immediately centrifuged. Serum was collected and stored at -80°C until analysis. Cotinine was analysed by RIA. The detectable range of measurement from the standard curve was 0.2-20 ng/mL cotinine, with an interassay coefficient of variation of 6-10%. A cut-off value of 14 ng/mL (previously proposed by different authors) was used for cord serum cotinine to discern between newborns of non-smoking mothers from smoking mothers [30]. Newborns exposed to SHS were categorised according to cord blood cotinine level as non exposed (cord serum cotinine < 1 ng/mL), low exposure (cord serum cotinine from 1 to 14 ng/mL), medium exposure (cord serum cotinine from 14 to 50 ng/mL), high exposure (cord serum cotinine > 50 ng/mL) and very high exposure (cord serum cotinine > 100 ng/mL) [30, 37].

Statistical methods

We compared sociodemographic data of different study groups using the Chi-square test or Fisher's exact test for categorical variables and Student's t-test for continuous variables. Furthermore, to compare parental smoking habits among each period of the study a logistic regression analysis with odds ratio (OR) was conducted. To assess the relationship between parental smoking habit and the mean cord blood cotinine levels, a univariate statistical analysis was used with cotinine levels as continuous variable and parental smoking habit as random factor. The categories of prenatal exposure were assessed by logistic multinomial regression. The independent variables were adjusted for socioeconomic status, mother and father's nationalities, mother's age and newborn's sex. Differences associated with p values lower than 0.05 were considered statistically significant. The SPSS program (version 16.0, SPSS Inc, Chicago, IL, USA) was used for the analysis of data.

Results

Table 1 shows the socioeconomics characteristics of the study groups. The differences between the 3 periods studied reflect the sociodemographic changes in the population attending at the Hospital del Mar. Recently, the percentage of foreign immigrants has increased significantly (practically doubled); the percentage of professionals has also grown as a result of a higher number of middle class people being attracted by the sea-side life in Barcelona.

Table 1 Sociodemographic characteristics of the study population

Parents' smoking habit

According to the self-reported questionnaires, 32.8% of the pregnant women reported daily smoking during pregnancy in 1996-98, 25.9% in 2002-04 and 34.1% in 2008; the statistics don't show significant differences in the number of mothers who smoked throughout pregnancy over the 12 years of the study. There were no significant differences between the groups regarding the self-reported tobacco use if maternal smoking expressed as NDI among the 3 groups of study is compared: mean = 5.60 (range: 0.80-28.00) in 1996-98, mean = 7.50 (range: 0.70-32.00) in 2002-04 and mean = 10.50 (range: 1.20-32.00) in 2008.

Assessing how smoking habit in families has varied with respect to mother's country of origin, a reduction in native homes where only the father was smoking: 29.6% in 1996-1998 and 13.7% in 2002-2004 (OR: 0.46; CI 95%: 0.23-0.95) was observed; however, this trend was not maintained in 2008 (25.7%). In homes where only the mother was smoking, there was an increase from 1996-1998 (11.5%) to 2002-2004 (25.5%) (OR: 2.31; CI 95%: 1.18-4.52) and although this trend was broken in 2008 (14.3%), it was without statistical significance. There was no significant change in homes with both parents smoking. In immigrant homes, there were no differences in the three study periods when only the father (34.1%, 22.4% and 23.1%) or only the mother (4.5%, 7.1% and 10.3%) were smoking; the number of homes where both parents were smoking was 3.4% in 1996-1998, 5.9% in 2002-2004, and increased to 23.1% in 2008 (OR: 5.82; CI 95%: 1.72-19.75).

Cotinine as biomarker of fetal SHS

The mean cord blood cotinine levels in the newborns from all the study groups were: 3.21 (range: 0.20-910.00) in 1996-98, 0.80 (range: 0.20-250.00) in 2002-04 and 0.44 (range: 0.20-128.00) in 2008.

Table 2 shows the stratification of prenatal SHS exposure based on cord blood cotinine in the five categories defined previously. The stratification criteria were the same as in a previous publication [37]. The results show an increase in the percentage of no SHS exposure in the most recent group compared to the previous groups while the percentages of both prenatal SHS exposure categories: low (1.1-14 ng/mL) and very high (> 100 ng/mL) show a decrease.

Table 2 Prenatal SHS exposure by measuring cotinine in cord blood

It is important to highlight that the higher decrease in the prevalence of SHS exposure occurred in the period from 1996-98 to 2002-04, but the downward trend was maintained from to 2002-04 to 2008.

Validity of the biomarker

Table 3 shows that in the first two groups of study there is a good correlation between the number of self-reported smoking parents and cord blood cotinine levels. Clearly, cord blood cotinine level is slightly higher when the father is the only smoker compared when neither parent is a smoker; but when the mother smokes, the increase is much higher. For 2008 the trend is the same, however the differences are smaller without reaching statistical significance.

Table 3 Parental smoking habit declared by self-report and probability distribution (mean, median and geometric mean) of cord blood cotinine level

To distinguish between newborns from smoking and non-smoking mothers, the cut-off of 14 ng/mL for cord serum cotinine was used. Table 4 shows that cord blood cotinine levels higher than 14 ng/mL correspond to smoking mothers (75.5 - 90.9%), with the exception of 2008 where cord blood cotinine levels are lower for the entire group due to less SHS.

Table 4 Parental smoking habit and cotinine levels in cord blood higher 14 ng/mL

Discussion

The results show a decreasing trend of exposure to SHS and an increase of prenatal non-exposure to SHS. This improvement was significant before the implementation of Spanish free-smoke legislation in 2005 and maintains the tendency after it. Globally, there was no change in the percentage of women smoking during pregnancy along the years, but there was an increase in the number of non-Spanish women who smoked during pregnancy.

Prenatal exposure

Our results demonstrate that in recent years the exposure to SHS has decreased as evidenced by a higher percentage of samples with cord blood cotinine < 1 ng/mL; at the same time prenatal exposure to low levels of SHS decreased in recent years (cord blood cotinine in the interval of 1.1 to 14 ng/mL). This reduction in SHS exposure has been observed in England (by questionnaire and cotinine in saliva) [46] and Italy (by questionnaire and cotinine in cord blood) [16, 47], The present study adds the objective advantage of serial biomarker determinations.

Moreover, the very high prenatal exposure to SHS (cord blood cotinine > 100 ng/mL) has decreased in all the three groups studied. It is important to point out a more marked decrease in prenatal SHS in 2002-04 immediately before the implementation of Spanish smoke-free legislation.

The growing implication of health care services in smoking cessation, the marked presence of negative messages regarding tobacco in the media and the public dialog prompted by the imminent implementation of smoke-free legislation may have had a cumulative effect on the decreasing trend of smoking prevalence. Following that period, the effect has been maintained due to the implementation of smoke-free legislation and due to the mass media pressure.

Furthermore, our study reasserts the importance of maternal smoking habit during pregnancy. Cotinine levels in newborns are slightly higher when the father smokes compared with the families where neither parent is a smoker. The cotinine levels increase a significantly when the mother is a smoker. In this stage of life, the importance of active maternal smoking is related to the direct passage of cotinine to the foetus across the placenta. This is different from maternal passive SHS when the father smokes; in this case, cotinine arrives to foetus through cord blood, after the mother inhaled the smoke.

Maternal smoking habit

Cord blood accounts for foetal tobacco exposure during the previous days or hours before collection and not for chronic exposure during the entire gestation. Nevertheless, cord serum cotinine appeared to be the most adequate biomarker of foetal exposure to smoking at the end of pregnancy, distinguishing not only active smoking from passive smoking, but also exposure to ETS from nonexposure [29, 33, 37, 43]. Studying the percentage of women who reported daily smoking during pregnancy, it becomes clear that the data from the self-reported questionnaire (32.8, 25.9 and 34.1%) does not show a significant variation in the patient population between the different periods of study while the percentage of newborns with cord blood cotinine > 14 ng/mL is decreasing progressively (34.2, 23.3 y 14.5%, respectively). The discrepancy between percentages reported by self-reported questionnaire and cord blood cotinine level that identify newborns from smoking mothers could be explained if one takes into consideration that the questionnaire inquires about the entire gestational period while the analytical value of cord blood cotinine refers only to the end of the pregnancy. We believe these data indicate that due to implementation of smoke-free legislation, maternal exposure to SHS in the hours just before delivery has decreased significantly.

The obtained results suggest that cord blood cotinine can be a useful biomarker in population studies monitoring the prevalence of SHS exposure and in preventing a bias related to self-report of active smoking or passive exposure or reluctancy to admit it. Maternal hair would be an adequate reference matrix [43] but it has methodological problems of standardization and accessibility as proven in clinical environment and public health studies.

The strong points of this study are that it is the first study that includes data collected before and after the implementation of Spanish smoke-free law and the prenatal exposure to SHS has been studied objectively by a biomarker measured in a non conventional matrix; it is non invasive for the newborn and prevents the bias inherent to maternal self-reports. Data comparison for different biomarkers in general population during the same period is not available at the moment but it could prove useful in the future. It should be interesting to collect new data after a longer period in order to confirm the stability and the trend in the data obtained.

There may be other factors that have an impact as tobacco control measures: negative messages in mass media campaigns and the public awareness derived from them, the increase in the price of tobacco, and specific public health programs to help smoking pregnant women quit. Nevertheless, our data suggest that the implementation of smoke-free legislation is on the right track in reaching one of its objectives: to "guarantee the non-smokers' rights to breath smoke- free air" as demonstrated by the lower cord blood cotinine level in newborns. However, we can not affirm that it had generated changes to facilitate the "smoking cessation by active smokers". The Cochrane review does not demonstrate a conclusive relationship between media campaigns against smoking in adults and the decrease of tobacco use; the

report about the impact of Spanish Law 28/2005 is pointing in the same direction [48, 49]. For this reason, it is necessary to consider other preventivemeasures, as specific actions focused on pregnant women according to the local demographic changes.

Conclusions

The three study periods (1996-2008) demonstrated a significant increase in the prevalence of newborns free of SHS exposure and a decrease in the prevalence of newborns exposed to SHS during pregnancy, especially at the very high levels of exposure. The change could be explained as a combination of several factors: negative messages in communication media and the public awareness derived from them; the implementation in 2005 of Spanish smoke-free legislation; and the increase in the tobacco price for the fiscal modification.

It is necessary to maintain and intensify the campaigns against prenatal SHS using communication media, more extensive and severe implementation of smoke-free legislation and educational actions in favour of decreasing the smoking habit among pregnant women. All these interventions will make it possible to improve the present results in the future [50].

Our study indicates that there is a significant maternal smoking habit in this geographical area. Our recommendation is that campaigns against smoking should be directed more specifically towards pregnant women with particular emphasis on non-native pregnant smokers due to the highest prevalence of tobacco consumption in the immigrant women.

References

  1. Cornuz J, Zellweger JP, Burnard B: Smoking cessation: importance for the patient and role of the practitioner. Schweiz Med Wochenschr. 1994, 124: 1315-1325.

    CAS  PubMed  Google Scholar 

  2. Villalbí JR, Salvador J, Cano-Serral G, Rodríguez-Sanz MC, Borrell C: Maternal smoking, social class and outcomes of pregnancy. Paediatr Perinat Epidemiol. 2007, 21: 441-447. 10.1111/j.1365-3016.2007.00845.x.

    Article  PubMed  Google Scholar 

  3. Salvador J, Villalbí R, Nebot M, Borrell C: Exposure to smoking during pregnancy: Barcelona (Spain), 1994-2001. An Pediatr (Barc). 2004, 60: 139-141. 10.1157/13056912.

    CAS  Google Scholar 

  4. Martínez-Frías ML, Rodríguez E, Bermejo E: Tobacco smoking during pregnancy in Spain: an analysis according to years, autonomous communities and maternal characteristics. Med Clin (Barc). 2005, 124: 86-92. 10.1157/13070863.

    Article  Google Scholar 

  5. Salvador J, Cunillé M, Ricart M, Roig A: Registre de defectes congènits de la ciutat de Barcelona (REDC). Informe anual 2008 (període 1992-2007). Barcelona: Publicacions de l'Agència de Salut Pública de Barcelona, 2010. Available in: URL: http://www.aspb.cat/quefem/docs/REDCB_WEB_2008.pdf

  6. Chiu HT, Isaac Wu HD, Kuo HW: The relationship between self-reported tobacco exposure and cotinines in urine and blood for pregnant women. Sci Total Environ. 2008, 406: 331-336. 10.1016/j.scitotenv.2008.07.005.

    Article  CAS  PubMed  Google Scholar 

  7. Bearer C, Emerson RK, O'Riordan MA, Roitman E, Shackleton C: Maternal tobacco smoke exposure and persistent pulmonary hypertension of the newborn. Environ Health Perspect. 1997, 105: 202-206. 10.1289/ehp.97105202.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  8. Castles A, Adams EK, Melvin CL, Kelsch C, Boulton ML: Effects of smoking during pregnancy: five meta-analyses. Am J Prev Med. 1999, 16: 208-215. 10.1016/S0749-3797(98)00089-0.

    Article  CAS  PubMed  Google Scholar 

  9. Law KL, Stroud LR, LaGasse LL, Niaura R, Liu J, Lester BM: Smoking during pregnancy and newborn neurobehavior. Pediatrics. 2003, 111: 1318-1323. 10.1542/peds.111.6.1318.

    Article  PubMed  Google Scholar 

  10. Leonardi-Bee J, Smyth A, Britton J, Coleman T: Environmental tobacco smoke and fetal health: systematic review and meta-analysis. Arch Dis Child Fetal Neonatal Ed. 2008, 93: F351-F361. 10.1136/adc.2007.133553.

    Article  CAS  PubMed  Google Scholar 

  11. Ortega JA, Martin M, Lopez MT, Fuster JL, Donat J, Lopez B, et al: Transgenerational tobacco smoke exposure and childhood cancer: An observational study. J Paediatr Child Health. 2010, 46 (6): 291-295. 10.1111/j.1440-1754.2010.01710.x.

    Article  Google Scholar 

  12. Fríguls B, García-Algar O, Puig C, Figueroa C, Sunyer J, Vall O: Perinatal exposure to tobacco and respiratory and allergy symptoms in first years of life. Arch Bronconeumol. 2009, 45: 585-590.

    Article  PubMed  Google Scholar 

  13. World No Tobacco Day 2007: smoke-free inside: create and enjoy 100% smoke-free environments. WHO Library Cataloguing-in-Publication Data

  14. Fernández E, Fu M, Pascual JA, López MJ, Pérez-Ríos M, Schiaffino A, et al: Impact of the Spanish smoking law on exposure to second-hand smoke and respiratory health in hospitality workers: a cohort study. PLoS One. 2009, 4: e4244-10.1371/journal.pone.0004244.

    Article  PubMed  PubMed Central  Google Scholar 

  15. Akhtar PC, Currie DB, Currie CE, Haw SJ: Changes in child exposure to environmental tobacco smoke (CHETS) study after implementation of smoke-free legislation in Scotland: national cross sectional survey. Br Med J. 2007, 335: 545-10.1136/bmj.39311.550197.AE.

    Article  Google Scholar 

  16. Franchini M, Caruso C, Perico A, Pacifici R, Monleon T, Garcia-Algar O, et al: Assessment of foetal exposure to cigarette smoke after recent implementations of smoke-free policy in Italy. Acta Paediatr. 2008, 97: 546-550. 10.1111/j.1651-2227.2008.00762.x.

    Article  PubMed  Google Scholar 

  17. Blanco-Marquizo A, Goja B, Peruga A, Jones MR, Yuan J, Samet JM, et al: Reduction of secondhand tobacco smoke in public places following national smoke-free legislation in Uruguay. Tob Control. 2010, 19 (3): 231-234. 10.1136/tc.2009.034769.

    Article  PubMed  Google Scholar 

  18. Fernández E, Villalbí JR, Córdoba R: Lessons learned from tobacco control in Spain. Salud Publica Mex. 2006, 48 (Supl 1): S148-S154.

    Article  PubMed  Google Scholar 

  19. Ley 28/2005, de 26 de diciembre, de medidas sanitarias frente al tabaquismo y reguladora de la venta, el suministro, el consumo y la publicidad de los productos del tabaco. 2005, 42241-50. BOE núm. 309. Martes

  20. Revuelta G, de Semir V: Medicina y Salud en la prensa diaria. Informe Quiral 1997-2006. Observatorio de la Comunicación Científica. 2008, Barcelona: Universitat Pompeu Fabra. Noclay SLL, 86-93.

    Google Scholar 

  21. Castellanos E, Nebot M: Pregnancy and smoking: significance of the problem and health-service based prevention. Med Clin (Barc). 1998, 111: 670-674.

    CAS  Google Scholar 

  22. Castellanos E, Nebot M, Rovira MT, Paya A, Muñoz MI, Carreras R: Impact of medical counselling on giving up smoking during pregnancy. Aten Primaria. 2002, 30: 556-560.

    Article  CAS  PubMed  Google Scholar 

  23. García-Algar O, Pichini S, Pacifici R, Castellanos E: Medical counseling to promote smoking cessation during pregnancy: clinical guide-lines for health professionals. Aten Primaria. 2003, 32: 481-491. 10.1157/13054020.

    Article  PubMed  Google Scholar 

  24. Programa Embaràs sense fum. Available on URL: http://www20.gencat.cat/docs/canalsalut/Home%20Canal%20Salut/Professionals/Temes_de_salut/Tabaquisme/documents/protembaras2007fum.pdf (Access: 2009, november 3)

  25. Hanrahan JR, Tager IB, Segal MR, Tosteson TD, Castile RG, Vunakis HV, Weiss ST, Speizer FE: The effect of maternal smoking during pregnancy on early infant lung fuction. Am Rev Respir Dis. 1992, 145: 1129-1135. 10.1164/ajrccm/145.5.1129.

    Article  CAS  PubMed  Google Scholar 

  26. Shiono PH, Behrman RE: Low birth weight: analysis and recommendations. Future Child. 1995, 5: 4-18. 10.2307/1602504.

    Article  CAS  PubMed  Google Scholar 

  27. Lambers DS, Clark KE: The maternal and fetal physiologic effects of nicotine. Semin Perinatol. 1996, 20: 115-126. 10.1016/S0146-0005(96)80079-6.

    Article  CAS  PubMed  Google Scholar 

  28. Bearer C, Emerson RK, O'Riordan MA, Roitman E, Shackleton C: Maternal tobacco exposure and persistent pulmonary hypertension of the newborn. Environ Health Perspect. 1997, 105: 202-206. 10.1289/ehp.97105202. Working Party of the Royal College of Physicians. Smoking and the young. London. 1992

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  29. Puig C, Garcia-Algar O, Monleon T, Pacifici R, Zuccaro P, Sunyer J, et al: A longitudinal study of environmental tobacco smoke exposure in children: parental self reports versus age dependent biomarkers. BMC Publ Health. 2008, 8: 47-10.1186/1471-2458-8-47.

    Article  Google Scholar 

  30. Nafstad P, Kongerud J, Botten G, Urdal P, Silsand T, Pedersen BS, et al: Fetal exposure to tobacco smoke products: a comparison between self-reported maternal smoking and concentrations of cotinine and thiocyanate in cord serum. Acta Obstet Gynecol Scand. 1996, 75: 902-907. 10.3109/00016349609055025.

    Article  CAS  PubMed  Google Scholar 

  31. Klebanoff MA, Levine RJ, Clemens JD, DerSimonian R, Wilkins DG: Serum cotinine concentration and selfreported smoking during pregnancy. Am J Epidemiol. 1998, 148: 259-262. 10.1093/oxfordjournals.aje.a009633.

    Article  CAS  PubMed  Google Scholar 

  32. Wu FY, Chiu HT, Wu HD, Lin CJ, Lai JS, Kuo HW: Comparison of urinary and plasma cotinine levels during the three trimesters of pregnancy. Paediatr Perinat Epidemiol. 2008, 22: 296-301. 10.1111/j.1365-3016.2008.00927.x.

    Article  PubMed  Google Scholar 

  33. Llaquet H, Pichini S, Joya X, Papaseit E, Vall O, Klein J, Garcia-Algar O: Biological matrices for the evaluation of exposure to environmental tobacco smoke during prenatal life and childhood. Anal Bioanal Chem. 2010, 396 (1): 379-399. 10.1007/s00216-009-2831-8.

    Article  CAS  PubMed  Google Scholar 

  34. Martinez-Sanchez JM, Fernandez E, Fu M, Pascual JA, Ariza C, Agudo A, et al: Assessment of exposure to secondhand smoke by questionnaire and salivary cotinine in the general population of Barcelona, Spain (2004-2005). Prev Med. 2009, 48: 218-223. 10.1016/j.ypmed.2008.12.020.

    Article  CAS  PubMed  Google Scholar 

  35. Dhar P: Measuring tobacco smoke exposure: quantifying nicotine/cotinine concentration in biological samples by colorimetry, chromatography and immunoassay methods. J Pharm Biomed Anal. 2004, 35: 155-168. 10.1016/j.jpba.2004.01.009.

    Article  CAS  PubMed  Google Scholar 

  36. Florek E, Breborowicz GH, Lechowicz W, Wachowiak A, Basior A, Wolna M, et al: Cotinine in urine of mother and their newborn and in cord serum and placenta as a biomarker of foetal exposure to tobacco smoke. Przegl Lek. 2006, 63: 900-906.

    PubMed  Google Scholar 

  37. Pichini S, Basagana XB, Pacifici R, Garcia O, Puig C, Vall O, et al: Cord serum cotinine as a biomarker of fetal exposure to cigarette smoke at the end of pregnancy. Environ Health Perspect. 2000, 108: 1079-1083. 10.1289/ehp.001081079.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  38. Chazeron I, Daval S, Ughetto S, Richard D, Nicolay A, Lemery D, et al: GC-MS determined cotinine in an epidemiological study on smoking status at delivery. Pulm Pharmacol Ther. 2008, 21: 485-488. 10.1016/j.pupt.2007.11.001.

    Article  PubMed  Google Scholar 

  39. Perkins SL, Belcher JM, Livesey JF: A Canadian tertiary care centre study of maternal and umbilical cord cotinine levels as markers of smoking during pregnancy: relationship to neonatal effects. Can J Public Health. 1997, 88: 232-237.

    CAS  PubMed  Google Scholar 

  40. Perkins SL, Livesey JF, Escares EA, Belcher JM, Dudley DK: High-performance liquid-chromatographic method compared with a modified radioimmunoassay of cotinine in plasma. Clin Chem. 1991, 37: 1989-1993.

    CAS  PubMed  Google Scholar 

  41. Pichini S, Puig C, García-Algar O, Pacifici R, Figueroa C, Vall O, Muñoz L, Sunyer J: Neonatal effects of smoking habit during pregnancy and sociodemographic determinants in Barcelona, Spain. Med Clin (Barc). 2002, 118: 53-56.

    Article  Google Scholar 

  42. Jedrychowski W, Perera F, Mroz E, Edwards S, Flak E, Bernert JT, et al: Fetal exposure to secondhand tobacco smoke assessed by maternal self-reports and cord blood cotinine: Prospective cohort study in Krakow. Matern Child Health J. 2009, 13: 415-423. 10.1007/s10995-008-0350-4.

    Article  PubMed  Google Scholar 

  43. Pichini S, Garcia-Algar O, Muñoz L, Vall O, Pacifici R, Figueroa C, Pascual JA, Diaz D, Sunyer J: Assessment of chronic exposure to cigarette smoke and its change during pregnancy by segmental analysis of maternal hair nicotine. J Expo Anal Environ Epidemiol. 2003, 13: 144-151. 10.1038/sj.jea.7500264.

    Article  CAS  PubMed  Google Scholar 

  44. Garcia-Algar O, Vall Combelles O, Puig Sola C, Mur Sierra A, Scaravelli G, Pacifici R, et al: Exposición prenatal a drogas de abuso utilizando el análisis del meconio en una población de bajo nivel socioeconómico en Barcelona. An Pediatr (Barc). 2009, 70: 151-158. 10.1016/j.anpedi.2008.08.008.

    Article  CAS  Google Scholar 

  45. Morini L, Groppi A, Marchei E, Vagnarelli F, Garcia-Algar O, Zuccaro P, Pichini S: Population baseline of meconium ethyl glucuronide and ethyl sulfate concentrations in newborns of nondrinking women in 2 mediterranean cohorts. Ther Drug Monit. 2010, 32: 359-363. 10.1097/FTD.0b013e3181d5f14a.

    Article  CAS  PubMed  Google Scholar 

  46. Sims M, Tomkins S, Judge K, Taylor G, Jarvis MJ, Gilmore A: Trends in and predictors of second-hand smoke exposure indexed by cotinine in children in England from 1996 to 2006. Addiction. 2010, 105: 543-553. 10.1111/j.1360-0443.2009.02805.x.

    Article  PubMed  Google Scholar 

  47. Charrier L, Serafini P, Giordano L, Zotti CM: Smoking habits in Italian pregnant women: Any changes after the ban?. J Public Health Policy. 2010, 31: 51-58. 10.1057/jphp.2009.43.

    Article  PubMed  Google Scholar 

  48. Bala M, Strzeszynski L, Cahill K: Mass media interventions for smoking cessation in adults. Cochrane Database of Systematic Reviews. 2008, 1: CD004704-

    PubMed  Google Scholar 

  49. Nebot M, Fernández E, (Coords): Evaluación del impacto de la ley de medidas sanitarias frente al tabaquismo. 2009, Barcelona: Sociedad Española de Epidemiología y Ministerio de Sanidad y Política Social, 9-43. Available in: URL: http://www.seepidemiologia.es/documents/dummy/Monografia- Grupo%20Trabajo%20sobre%20tabaquismo.pdf)

    Google Scholar 

  50. Muggli M, Lockhart N, Ebbert J, Jimenez-Ruiz C, Riesco JA, Hurt R: Legislating tolerance: Spain's national public smoking law. Tob Control. 2010, 19: 24-30. 10.1136/tc.2009.031831.

    Article  PubMed  Google Scholar 

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Correspondence to Óscar García-Algar.

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Authors' contributions

CP, analyzed the mother-infant data, reviewed the literature and the final manuscript, and was the main contributor in writing the manuscript. OV, was the paediatrician responsible for coordination of data and samples flow and contributed in writing the manuscript. ÓG-A, analyzed the mother-infant data, reviewed the literature and was a major contributor in writing the manuscript. EP, was an important laboratory technician in biomarkers analyses and contributed in writing the manuscript. SP, was the major expert in laboratory analysis of biomarkers in alternative matrices and contributed in writing the manuscript. ES, analyzed the mother-infant data and was a major contributor in writing the manuscript. JRV, was the expert responsible for final data analysis and contributed in writing the manuscript. All authors read and approved the final manuscript.

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Puig, C., Vall, O., García-Algar, Ó. et al. Assessment of prenatal exposure to tobacco smoke by cotinine in cord blood for the evaluation of smoking control policies in Spain. BMC Pregnancy Childbirth 12, 26 (2012). https://doi.org/10.1186/1471-2393-12-26

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