Table III.
Exposure to passive smoking and fecundability among female never smokers.
| No. of cycles | No. of pregnancies | Unadjusted FR (95% CI) | Adjusteda FR (95% CI) | Adjustedb FR (95% CI) | |
|---|---|---|---|---|---|
| Current passive smoke exposure | |||||
| None | 15660 | 2349 | 1.00 (Reference) | 1.00 (Reference) | 1.00 (Reference) |
| Any | 771 | 82 | 0.80 (0.61, 1.05) | 0.85 (0.65, 1.12) | 0.93 (0.70, 1.25) |
| Current passive smoke exposure, partner smoking | |||||
| None, partner not regular smoker | 15035 | 2271 | 1.00 (Reference) | 1.00 (Reference) | 1.00 (Reference) |
| Any, partner not regular smoker | 415 | 58 | 1.01 (0.75, 1.36) | 1.05 (0.77, 1.42) | 1.12 (0.81, 1.55) |
| None, partner is regular smoker | 625 | 78 | 0.88 (0.71, 1.09) | 0.96 (0.78, 1.19) | 0.98 (0.79, 1.21) |
| Any, partner is regular smoker | 356 | 24 | 0.54 (0.35, 0.83) | 0.59 (0.38, 0.91) | 0.66 (0.42, 1.04) |
| Lifetime passive smoke exposure | |||||
| Age 0–10 years | 4608 | 629 | 0.99 (0.87, 1.13) | 1.02 (0.89, 1.15) | 1.03 (0.91, 1.16) |
| Age 11–20 years | 3459 | 457 | 0.94 (0.81, 1.08) | 0.96 (0.84, 1.11) | 0.99 (0.87, 1.14) |
| Age >20 | 2143 | 263 | 0.94 (0.82, 1.08) | 0.99 (0.86, 1.13) | 1.00 (0.87, 1.14) |
| Current | 771 | 82 | 0.85 (0.64, 1.13) | 0.86 (0.65, 1.14) | 0.93 (0.69, 1.26) |
| In utero smoke exposure | |||||
| None | 13951 | 2069 | 1.00 (Reference) | 1.00 (Reference) | 1.00 (Reference) |
| <10 cigs/day | 2148 | 331 | 1.03 (0.93, 1.15) | 1.06 (0.95, 1.19) | 1.11 (0.98, 1.25) |
| ≥10 cigs/day | 332 | 31 | 0.64 (0.45, 0.91) | 0.65 (0.46, 0.93) | 0.75 (0.52, 1.06) |
aAdjusted for age, race/ethnicity, education and annual household income. In utero smoke exposure models adjusted for age, race/ethnicity, and mother and father’s education.
bAdditionally adjusted for BMI, sugar-sweetened beverage intake, Healthy Eating Index score, multivitamin or folic acid supplement use, sleep duration, PSS-10 score, MDI score, parity, intercourse frequency and doing something to improve chances of conception.