Table I.
Baseline characteristics of female 9524 female pregnancy planners, by antibiotic use, in PRESTO.
| Characteristica | Antibiotic use during study participation |
|
|---|---|---|
| No | Yes | |
| Number of participants, N (%) | 8092 (85.0) | 1432 (15.0) |
| Age (years, mean) | 29.8 | 30.1 |
| Partners age (years, mean) | 31.8 | 32.0 |
| White, non-Hispanic (%) | 84.7 | 82.4 |
| Annual household income <US$50 000 (%) | 19.5 | 22.7 |
| <College degree (%) | 27.5 | 30.1 |
| Geographic region (%) | ||
| US Midwest | 21.7 | 21.5 |
| US Northeast | 22.5 | 20.7 |
| US South | 23.0 | 28.1 |
| US West | 16.1 | 16.1 |
| Canada | 16.5 | 13.4 |
| Physical activity (MET-hours/week, mean) | 34.2 | 32.3 |
| BMI (kg/m2, mean) | 27.9 | 28.6 |
| Multivitamin use (%) | 80.0 | 80.0 |
| Ever smoker (%) | 22.8 | 26.9 |
| Alcohol intake (drinks/week, mean) | 3.2 | 3.2 |
| Parous (%) | 33.0 | 32.7 |
| Irregular menstrual cycles (%) | 16.8 | 20.2 |
| Doing something to improve changes of conceiving (%) | 77.3 | 74.6 |
| Intercourse frequency <1 time/week (%) | 20.9 | 21.5 |
| Intercourse frequency >3 time/week (%) | 15.8 | 18.5 |
| Hormonal last method of contraception (%) | 37.3 | 41.7 |
| History of spontaneous abortion (%) | 25.0 | 28.8 |
| History of infertility (%) | 8.3 | 12.2 |
| History of STI (%)b | 14.1 | 17.8 |
a
All characteristics except for age are age-standardized to the cohort at baseline.
b
Includes genital warts, herpes, chlamydia or pelvic inflammatory disease.
PRESTO, Pregnancy Study Online; STI, sexually transmitted infections; MET, metabolic equivalent of task.