TABLE 1.
Time to pregnancy by age
| Gender | Age, y | Time to pregnancy, mo (95% CI) | P value |
|---|---|---|---|
| Women | ≤25 | 5.0 (3.7–6.4) | .04 |
| >25–30 | 5.9 (4.8–6.9) | ||
| >30–35 | 7.5 (6.1–8.8) | ||
| >35 | 9.5 (6.8–12.1) | ||
| Men | ≤25 | 7.0 (5.1–8.9) | <.001 |
| >25–30 | 6.9 (5.6–8.2) | ||
| >30–35 | 9.3 (7.9–10.7) | ||
| >35–40 | 11.4 (9.5–13.4) | ||
| >40–45 | 12.4 (8.6–16.2) | ||
| >45 | 37.2 (27.1–47.3) | ||
| Men with women <25 y | |||
| >25–30 | 6.2 (4.3–8.0) | <.001 | |
| >30–35 | 6.0 (2.8–9.1) | ||
| >35–40 | 11.5 (7.3–15.7) | ||
| >40 | 23.2 (14.5–31.9) |
Adapted.33
Models adjusted for age of other partner; women’s weight, body mass index, smoking, alcohol consumption, tea and coffee intake, parity, contraceptive use, menstrual pattern, and age at menarche; and men’s smoking, alcohol consumption, coital frequency, and living standard. Also excluded women with gynecologic history, other risk factors for subfertility, or conceived after treatment.
CI, confidence interval.