Table 5.

Strength of Association: History of Subacute Ear Infections by 5 Years Versus Time of Smoking and History of Maternal Smoking

Smoking
(Cigarettes/Day)
Model 1*Model 2
OR95% CIOR95% CI
First clinic visit1–91.60.9 –2.31.71.0 –3.0
10–192.41.3 –4.42.61.4 –5.0
20+2.61.2 –5.32.81.3 –6.0
Third trimester1–91.10.6 –1.91.00.6 –1.9
10–191.00.5 –2.00.90.5 –1.8
20+0.70.3 –1.50.50.2 –1.2
6 mo1–90.60.4 –1.10.60.4 –1.1
10–190.80.5 –1.50.80.4 –1.4
20+0.80.4 –1.60.90.4 –1.7
5 y1–91.10.7 –1.91.10.7 –1.7
10–191.00.6 –1.60.90.6 –1.5
20+0.80.5 –1.30.70.4 –1.2
  • * Smoking at different times compared with nonsmoking mothers as baseline.

  • Smoking at each phase similar to model 1. In addition to confounders including child's age and gender, maternal age and education, maternal employment at 5 years, marital status at 5 years, socioeconomic status, breastfeeding history, use of day care, and number of siblings or children in the household. Nonsmoking mothers used as baseline.