Table 2 Weighted demographic characteristics by duration of oral contraceptive use
Characteristics | Duration of oral contraceptive use | p for trend | |||
|---|---|---|---|---|---|
Never (n = 2844) | <0– < 12 mo (n = 304) | 12–24 mo (n = 132) | >24 mo (n = 76) | ||
Age (years), mean (SE) | 43.9 (0.1) | 43.5 (0.3) | 44.9 (0.5) | 45.5 (0.7) | 0.002 |
BMI, mean (SE) | 23.4 (0.1) | 23.3 (0.2) | 23.8 (0.4) | 23.7 (0.4) | 0.161 |
Education (%) | <0.001 | ||||
< High school | 24.9 | 35.2 | 48.5 | 34.6 | |
High school | 48.5 | 42.9 | 37.3 | 58.1 | |
> High school | 26.6 | 21.9 | 14.2 | 7.3 | |
Average household income (US$/month), mean (SE) | 2712.3 (59.5) | 2626.2 (103.1) | 2278.6 (137.8) | 2005.3 (143.2) | <0.001 |
Regular exercise (%) | 54.6 | 53.8 | 56.9 | 65.9 | 0.041 |
Smoking (cigarettes/day), mean (SE) | 0.39 (0.05) | 0.79 (0.17) | 1.11 (0.42) | 1.64 (0.49) | <0.001 |
Alcohol drinking (g/day), mean (SE) | 3.14 (0.17) | 3.41 (0.51) | 5.14 (0.82) | 4.55 (1.06) | 0.044 |