Table I.
Baseline characteristics of PRESTO based on cycle app use. *
| All women | Non-users of cycle apps | Users of selected cycle apps | Users of other cycle apps | |
|---|---|---|---|---|
| Number of women | 8363 | 2286 | 3339 | 2738 |
| Age, years (mean) | 29.9 | 30.2 | 29.7 | 30.0 |
| Partners age, years (mean) | 31.8 | 32.0 | 31.7 | 31.8 |
| BMI, kg/m2 (mean) | 28.0 | 28.0 | 27.6 | 28.3 |
| Partners BMI, kg/m2 (mean) | 28.2 | 28.1 | 28.3 | 28.3 |
| Relationship duration, 5 years (%) | 49.3 | 48.2 | 53.1 | 45.7 |
| Attempt time at study entry, cycles (mean) | 2.1 | 1.8 | 2.2 | 2.2 |
| Non-Hispanic White (%) | 84.2 | 80.9 | 87.0 | 83.6 |
| Income >50 000 (%) | 59.1 | 62.2 | 54.8 | 61.9 |
| Education ≥ college (%) education | 72.0 | 70.2 | 75.8 | 69.0 |
| Sleep <7 h (%) | 25.4 | 26.0 | 23.4 | 27.3 |
| Prior pregnancy (%) | 51.2 | 53.3 | 50.8 | 50.1 |
| Took folic acid/multivitamin (%) | 75.6 | 66.8 | 83.3 | 73.7 |
| Prior birth (%) | 33.3 | 37.5 | 31.3 | 32.1 |
| Last form of contraception hormonal (%) | 38.3 | 44.0 | 37.4 | 34.6 |
| Current smoker (%) | 6.9 | 8.2 | 5.0 | 8.2 |
| Intercourse ≥2 times per week (%) | 60.5 | 59.5 | 60.9 | 60.8 |
| Partner education ≥ College education (%) | 54.4 | 53.6 | 58.0 | 50.5 |
| Married (%) | 90.0 | 88.3 | 91.1 | 90.0 |
| Alcohol intake, drinks/week (mean) | 3.2 | 3.1 | 3.2 | 3.2 |
| Caffeine intake, mg/day | 124.1 | 120.6 | 128.2 | 123.7 |
| History of subfertility (%)** | 13.3 | 15.9 | 11.5 | 13.4 |
| Irregular periods (%) | 17.3 | 19.9 | 15.8 | 17.0 |
| Cycle length (median days) | 29 | 29 | 29 | 29 |
*
All characteristics, with the exception of age, are standardised to age distribution of cohort at baseline.
**
Among individuals who had previously attempted to conceive.