Table 1. Characteristics of the Participants According to Randomly Assigned Group.
| Characteristic | No. (%) | |
|---|---|---|
| Screen and treat (n = 3333) | Control (n = 3338) | |
| Age, mean (SD), y | 30.5 (5.0) | 30.7 (5.1) |
| Racial and ethnic groupa | ||
| Asian | 57 (1.8) | 55 (1.7) |
| Caucasianb | 147 (4.5) | 144 (4.3) |
| European | 1968 (60.7) | 1982 (61.5) |
| North African | 762 (23.5) | 725 (21.9) |
| Sub-Saharan African | 306 (9.4) | 317 (9.6) |
| Other race or ethnicity | 77 (2.3) | 89 (2.7) |
| Bachelor’s degree or higher educationa | 2716 (82.1) | 2761 (83.3) |
| Employeda | 2312 (69.8) | 2329 (70.1) |
| Nulliparous | 1671 (50.1) | 1767 (52.8) |
| Previous early miscarriagec | 737 (22.2) | 742 (22.3) |
| Previous abortion | 633 (19.0) | 645 (19.4) |
| Gestational age at inclusion, mean (SD), wk | 15.5 (2.8) | 15.5 (2.8) |
| Assisted reproductive technology use | 189 (5.7) | 203 (6.1) |
| Body mass index, mean (SD)d | 24.2 (4.9) | 24.0 (4.7) |
| Tobacco usea | 364 (11.0) | 361 (10.9) |
| Smoking during pregnancy (>10 cigarette/d)a | 20 (0.6) | 24 (0.7) |
| Alcohol usea | 29 (0.9) | 33 (1.0) |
| Vaginal toilet practice during pregnancya | 309 (9.4) | 305 (9.3) |
a
Variable was self-reported.
b
Native to the Caucasus region.
c
Previous abortion includes therapeutic and spontaneous abortions.
d
Calculated as weight in kilograms divided by height in meters squared.