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 |