Table 4.

The adjusted odds ratios of birth weight <10th percentile, FGR, and LBW for smoking categories (continuous variables).

Newborn Outcomes/ Smoking Categories for (Ever) Smokers	OR (95% CI:); p	AOR-d * (95% CI:); p
Birth weight <10th percentile risk
Length of smoking time (for 1 year)	1.09 (1.04–1.13); <0.001	1.09 (1.04–1.14); 0.001
Cigarettes/day (for 1 cigarette)	1.01 (0.99–1.03); 0.297	1.01 (0.99–1.03); 0.391
Pack-years (for 1)	1.05 (1.00–1.10); 0.035	1.05 (1.00–1.10); 0.065
FGR risk
Length of smoking time (for 1 year)	1.07 (1.00–1.16); 0.058	1.08 (0.99–1.17); 0.086
Cigarettes/day (for 1 cigarette)	1.01 (0.97–1.04); 0.817	1.00 (0.95–1.05); 0.989
Pack-years (for 1)	1.02 (0.95–1.10); 0.530	1.02 (0.94–1.10); 0.611
LBW risk
Length of smoking time (for 1 year)	1.07 (1.02–1.13); 0.006	1.13 (1.05–1.21); 0.001
Cigarettes/day (for 1 cigarette)	1.01 (0.98–1.03); 0.564	1.02 (0.99–1.05); 0.140
Pack-years (for 1)	1.04 (1.00–1.09); 0.077	1.08 (1.02–1.14); 0.012

* AOR-d: adjusted odds ratios (and confidence intervals) calculated in the multidimensional logistic regression (p-value was calculated in the Wald test and p < 0.05 was assumed to be significant); the odds ratios were adjusted for: primiparous women, pre-pregnancy BMI, maternal age, gestational weight gain outside the range of the recommendations regardless of the BMI category (for FGR) plus fetal sex, gestational age, maternal height, preeclampsia, gestational diabetes mellitus (for birth weight <10th percentile and LBW). FGR: fetal growth restriction; LBW: birth weight <2500 g.