Table 2.
Former and current OCP users among premenopausal women, NHANES III, 1988–1994
| OCP use | Former use (N = 2604) | Current user (N = 774) |
|---|---|---|
| Age (years): mean (SEa) | 35.5 (0.2) | 27.6 (0.4) |
| Age at first use of OCP (years): mean (SEa) | 20.2 (0.1) | 20.0 (0.3) |
| Years of taking OCP: mean (SEa) | 4.3 (0.2) | 6.7 (0.6) |
| <1 | 21.7 % | 8.0 % |
| 1–5 | 41.0 % | 37.7 % |
| 5–10 | 24.7 % | 34.4 % |
| ≥10 | 12.6 % | 19.9 % |
| Years since stopping OCP: mean (SEa) | 9.8 (0.2) | |
| <1 | 8.2 % | |
| 1–5 | 21.3 % | |
| 5–10 | 20.8 % | |
| ≥10 | 49.7 % |
OCP oral contraceptive pill, SD standard deviation
a
Survey-based mean estimation with linearized standard error