Table 3.
Parity | Never Smokers (n = 434) |
Ever Smokers (n = 1,418) |
||||||||||
Cases |
Controls |
AORb | 95% CI | Cases |
Controls |
AORb | 95% CI | |||||
No. | % | No. | % | No. | % | No. | % | |||||
0 (nulliparous) | 21 | 21 | 50 | 15 | 1 | Referent | 128 | 14 | 67 | 13 | 1 | Referent |
≥1 | 81 | 79 | 282 | 85 | 0.46 | 0.25, 0.85 | 774 | 86 | 449 | 87 | 0.82 | 0.58, 1.17 |
Abbreviations: AOR, adjusted odds ratio; CI, confidence interval.
P = 0.12 in a likelihood ratio test comparing the multivariate model containing an interaction term with the same model without the interaction term.
Adjusted for age, smoking status, pack-years of smoking, and years since quitting smoking. Stratum-specific odds ratios were directly estimated in the full data set of 1,852 women.