Table 3 Association between duration of smoking cessation and the risk of bronchial asthma at the age of 3 in mothers who quit smoking before pregnancy.

From: Maternal smoking status before and during pregnancy and bronchial asthma at 3 years of age: a prospective cohort study

Duration after quitting smoking (years)

Number

cOR (95% CI)

aOR (95% CI)

Never

45,248

1.00

1.00

0–5

9328

1.16 (1.07–1.27)

1.10 (1.01–1.21)

6–10

5777

1.17 (1.06–1.30)

1.14 (1.02–1.27)

 ≥ 11

2296

1.03 (0.87–1.22)

1.00 (0.84–1.19)

  1. cOR, crude odds ratio; aOR, adjusted odds ratio; CI, confidence interval. Boldface indicates statistical significance (p < 0.05).
  2. Adjusted for partner's smoking status before birth, frequency of second-hand smoke exposure during pregnancy, maternal history of bronchial asthma, maternal age at birth, pre-pregnancy body mass index, maternal educational level, child’s sex, gestational age at birth, mode of delivery, attendance to childcare facility at 1 year of age, breastfeeding at 1 year of age, and older siblings.
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