Adverse effects of parental smoking during pregnancy in urban and rural areas

Table 2 Parental smoking during pregnancy correlated with birthweight (g) and low birthweight

	Linear regression		Logistic regression
	Birthweight	p	Low birthweight	p
	Mean ± SE	p	OR (95% CI)	p
Parental smoking during pregnancy^a
Neither parent	3057 ± 16.2	-	1.00	-
Only father	3094 ± 9.1	0.047	0.89 (0.51-1.54)	0.665
Only mother	2921 ± 52.2	0.013	2.58 (0.75-8.90)	0.135
Both parents	2973 ± 47.6	0.096	2.37 (0.51-10.92)	0.270
Paternal smoking amount^b
None	3051 ± 16.2	-	1.00	-
1-10 cigarettes/day	3108 ± 14.2	0.009	0.81 (0.58-1.14)	0.230
11-20 cigarettes/day	3094 ± 14.1	0.044	0.66 (0.46-0.94)	0.022
>20 cigarettes/day	2900 ± 28.8	<0.001	2.09 (1.38-3.17)	<0.001
Maternal smoking amount^b
None	3085 ± 8.7	-	1.00	-
1-10 cigarettes/day	2968 ± 51.2	0.025	1.66 (0.84-3.27)	0.144
>10 cigarettes/day	2734 ± 76.4	<0.001	4.07 (1.88-8.82)	<0.001
Smoking amount in both parents^b
None	3067 ± 16.9	-	1.00	-
1-20 cigarettes/day	3095 ± 10.0	0.154	0.95 (0.69-1.31)	0.747
>20 cigarettes/day	2911 ± 26.4	<0.001	2.24 (1.47-3.41)	<0.001

Note. SE = standard error; OR = odds ratio; CI = confidence interval.
^aAdjusted for birth order, maternal age at delivery, maternal employment, parental BMI, and residence.
^bAdjusted for birth order.

ISSN: 1471-2393