Table 4

 Demographic description of pregnant women and newborns

VariablesNever smoking mothers n (%)Quitting mothers n (%)Non-quitting mothers n (%)Total
*p<0.05 in corresponding χ2 tests for comparing quitting mothers with non-quitting mothers.
Total8892 (93.6)400 (4.2)207 (2.2)9499 (100%)
Age of pregnant mothers
    <24 years1299 (14.6)134 (33.5)85 (41.1)1518 (16.0%)
    25–29 years3248 (36.5)143 (35.7)60 (29.0)3451 (36.3%)
    >30 years4345 (48.9)123 (30.8)62 (30.9)4530 (47.7%)
Parity*
    First (primigravida)4692 (55.8)256 (64.0)96 (46.4)5044 (53.1%)
    Second or more4198 (47.2)144 (36.0)111 (53.6)4452 (46.9%)
Education level of mothers*
    Middle school or below859 (9.7)46 (11.5)57 (27.5)962 (10.3%)
    High school2938(33.0)270 (67.5)131(63.3)3339 (35.7%)
    College or above4964 (55.8)79 (19.7)18 (8.7)5061 (54.0%)
Sex of newborn
    Male4685 (52.7)221 (55.2)99 (47.8)4805 (51.7%)
    Female4205 (47.3)178 (44.5)107 (51.7)4490 (48.3%)