Table 2.
Analysis and Parity | Cases |
Controls |
Age-Adjusted |
Multivariate-Adjusteda |
P Value | ||||
No. | % | No. | % | OR | 95% CI | OR | 95% CI | ||
Dichotomous analysis (n = 1,852)b | (n = 1,004) | (n = 848) | |||||||
0 (nulliparous) | 149 | 15 | 117 | 14 | 1 | Referent | 1 | Referent | |
≥1 | 855 | 85 | 731 | 86 | 0.74 | 0.56, 0.99 | 0.71 | 0.52, 0.97 | 0.03 |
Categorical analysis (n = 1,451)c | (n = 672) | (n = 779) | |||||||
0 (nulliparous) | 117 | 17 | 110 | 14 | 1 | Referent | 1 | Referent | |
1 | 85 | 13 | 84 | 11 | 0.97 | 0.63, 1.49 | 0.97 | 0.59, 1.60 | |
2 | 160 | 24 | 214 | 27 | 0.69 | 0.48, 0.98 | 0.75 | 0.50, 1.13 | |
3 | 136 | 20 | 194 | 25 | 0.56 | 0.39, 0.81 | 0.52 | 0.35, 0.79 | |
≥4 | 174 | 26 | 177 | 23 | 0.64 | 0.45, 0.92 | 0.57 | 0.38, 0.85 | 0.0003d |
Abbreviations: CI, confidence interval; OR, odds ratio.
Adjusted for age (years), smoking status (current, former, or never smoker), pack-years of smoking, and years since quitting smoking.
Included cases and controls enrolled in the study between 1992 and 2004.
Included cases and controls enrolled in the study between 1992 and 2002.
P value from a test for linear trend with adjustment for age, smoking status, pack-years of smoking, and years since quitting smoking.