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Table 5 Multivariate analysis of smoking and birth weight of full-term infants (n = 1124)

From: Smoking during pregnancy and harm reduction in birth weight: a cross-sectional study

Variable β SE p CI (β; 95%)
(Intercept) − 750.57 927.63 0.000 (− 2568.70 to 1067.55)
Smoking in pregnancy
 Yes, 11 to 40 cigarettes per day −435.01 152.12 0.004 (−733.16 to −136.87)
 Yes, 6 to 10 cigarettes per day −320.41 109.74 0.004 (−535.51 to − 105.32)
 Yes, 1 to 5 cigarettes per day 54.81 150.09 0.715 (− 348.99 to 239.37)
No     reference
Live with a partner
 Yes 93.46 92.59 0.313 (−88.01 to 274.920
 No     reference
Prenatal care in public service
 Yes −1.10 72.10 0.988 (− 142.42 to 140.21)
 No     reference
≥ 7 prenatal medical visits     
 Yes 125.21 80.30 0.119 (−32.18 to 282.60)
 No     reference
Illegal drug use
 Yes − 445.41 385.79 0.248 (− 1201.55 to 310.73)
 No     reference
Emotional problems
 Yes 127.67 72.15 0.077 (−13.74 to 269.08)
 No     reference
Anemia
 Yes −3.09 99.58 0.975 (−198.27 to 192.09)
 No     reference
High blood pressure/pre-eclampsia/eclampsia/ HELLP syndromea
 Yes 19.75 91.79 0.830 (− 160.15 to 199.66)
 No     reference
Hyperemesis
 Yes − 143.85 134.86 0.286 (− 408.18 to 120.47)
 No     reference
Infection
 Yes −53.29 70.23 0.448 (− 190.95 to 84.36)
 No     reference
Age at delivery (years) −0.77 6.14 0.900 (−12.80 to 11.25)
Gestational age (weeks) 111.48 11.23 < 0,001 (−12.80 to 11.25)
Interval between deliveries (years) 4.56 8.04 0.571 (−11.19 to 20.31)
  1. aHELLP hemolysis, elevated liver enzymes, low platelet count