Table 2. Baseline characteristics of 3,521 Snart-Gravid participants according to time-to-pregnancy.
| Characteristic a | Time-to-pregnancy at index conception (cycles) | |||
|---|---|---|---|---|
|
| ||||
| <3 | 3-5 | 6-11 | ≥12 | |
| Number of women | 504 | 851 | 942 | 1,224 |
| Age, years (mean) | 29.2 | 29.0 | 29.4 | 30.7 |
| Male partner's age, years (mean) | 31.2 | 30.7 | 30.9 | 30.3 |
| BMI, kg/m2 (mean) | 23.4 | 24.0 | 24.1 | 24.8 |
| Regular cycles (%) | 78.1 | 79.4 | 72.8 | 73.8 |
| Gravid (%) | 54.0 | 50.4 | 46.9 | 36.2 |
| Parous (%) | 46.6 | 38.1 | 32.5 | 21.6 |
| Current regular smoker at baseline (%) | 7.8 | 9.8 | 11.7 | 17.2 |
| ≥5 pack-years of ever smoking (%) | 15.1 | 15.4 | 16.9 | 18.8 |
| Smoked during pregnancy (%) | 4.4 | 5.5 | 5.7 | 8.7 |
| Higher education >4 years (%) | 28.3 | 27.4 | 22.1 | 18.0 |
| High blood pressure (%) | 8.9 | 9.0 | 8.1 | 9.3 |
| Type 2 diabetes (%) | 1.9 | 1.4 | 1.7 | 1.1 |
| Uterine fibroids (%) | 2.0 | 2.6 | 2.5 | 1.8 |
| Infertility history reported at baseline (%) | 4.1 | 6.8 | 10.3 | 28.9 |
| Use of fertility drugs for index pregnancy (%) | 1.3 | 1.6 | 10.7 | 32.5 |
| Male birth | 49.9 | 52.1 | 49.8 | 52.3 |
| Attempt time at study entry, cycles (mean) | 0.6 | 1.5 | 3.4 | 8.4 |
a
All characteristics (except age) are age-standardized to cohort at baseline. Restricted to first imputed data set.