Table I.
Selected baseline characteristics of participants in the PRESTO (2013–2018), Snart Gravid (2007–2011) and Snart Foraeldre (2011–2018) cohorts.
| Characteristic | PRESTO (n = 5827) | SG/SF (n = 8504) |
|---|---|---|
| Age (years), mean | 29.9 | 28.7 |
| Male partner’s age (years), mean | 31.9 | 31.0 |
| Cycles of pregnancy attempt at study entry, mean | 2.1 | 2.0 |
| White, non-Hispanic, % | 83.5 | —a |
| <College degree, % | 26.6 | 33.4 |
| Annual household income <$50 000/300 000 DDK | 20.6 | 14.3 |
| Parous, % | 29.6 | 35.4 |
| Unemployed, % | 4.1 | 2.8 |
| BMI (kg/m2), mean | 27.7 | 24.1 |
| Physical activity (MET-hours/week), mean | 34.8 | 45.6 |
| Current regular smoker, % | 6.9 | 10.2 |
| Alcohol intake (drinks/week), mean | 3.2 | 2.8 |
| Caffeine intake (mg/day), mean | 124.0 | 133.6 |
| Sugar-sweetened beverage (drinks/week), mean | 2.9 | 1.0 |
| Current marijuana use, % | 12.4 | 0.6 |
| Daily multivitamin or folic acid intake, % | 79.0 | 55.5 |
| Medication use in past 4 weeks, % | ||
| Hay fever medication | 4.7 | 3.0 |
| Antibiotics | 8.4 | 6.7 |
| Antidepressants or anxiolytics | 11.4 | 1.9 |
| Asthma medication | 5.9 | 1.8 |
| Migraine medication | 9.6 | 2.1 |
| Influenza vaccine in past 2 months, % | 11.2 | 0.9 |
| Irregular menstrual cycles, % | 17.1 | 7.6 |
| Menstrual cycle length (days), mean | 30.0 | 30.3 |
| Intercourse frequency < 1 time/week, % | 21.9 | 17.7 |
| Doing something to improve conception chances, % | 75.3 | 59.4 |
| Hormonal last method of contraception, % | 39.6 | 60.9 |
aWe did not collect data on race/ethnicity in Denmark.