Table 1.
Baseline demographics and clinical characteristics (full analysis set)
| Group A (activated acoustic alarm) | Group B (deactivate acoustic alarm) | Total | |
|---|---|---|---|
| Mean age (years) (SD) | 25.3 (4.3) | 25.7 (4.0) | 25.5 (4.1) |
| Mean BMI (SD) | 22.7 (2.9) | 22.4 (3.1) | 22.5 (3.0) |
| Caucasian, N (%) | 215 (86.0) | 216 (86.7) | 431 (86.4) |
| Smoking | |||
| Never, N (%) | 146 (58.4) | 144 (57.8) | 290 (58.1) |
| Former, N (%) | 30 (12.0) | 30 (12.0) | 60 (12.0) |
| Current, N (%) | 74 (29.6) | 75 (30.1) | 149 (29.9) |
| Race, N (%) | |||
| White | 215 (86) | 216 (86.7) | 431 (86.4) |
| Black/African | 2 (0.8) | 0 | 2 (0.4) |
| American Asian | 0 | 1 (0.4) | 1 (0.2) |
| Missing/not reported | 33 (13.2) | 32 (12.4) | 65 (12.8) |
| Educational level, N (%) | |||
| Elementary | 5 (2) | 5 (2) | 10 (2) |
| Secondary | 109 (43.6) | 95 (38.2) | 204 (40.9) |
| College/university | 136 (54.4) | 149 (59.8) | 285 (57.1) |
| Alcohol consumption, N (%) | |||
| Abstinent | 74 (29.6) | 76 (30.5) | 150 (30.1) |
| Light | 173 (69.2) | 165 (66.3) | 338 (67.7) |
| Moderate | 3 (1.2) | 8 (3.2) | 11 (2.2) |
| Number of pregnancies, N (%) | |||
| 0 | 193 (77.2) | 184 (73.9) | 377 (75.6) |
| ≥1 | 57 (22.8) | 65 (26.1) | 122 (24.4) |
| Number of births, N (%) | |||
| 0 | 205 (82.0%) | 198 (79.5%) | 403 (80.8) |
| ≥1 | 45 (18.0) | 51 (20.5) | 96 (19.2) |
| Previous contraception, N (%) | |||
| None | 12 (4.8) | 12 (4.8) | 24 (4.8) |
| Oral | 205 (82.0) | 213 (85.5) | 418 (83.8) |
| Vaginal | 4 (1.6) | 3 (1.2) | 7 (1.4) |
| Transdermal | 1 (0.4) | 1 (0.4) | 2 (0.4) |
| Barrier | 28 (11.2) | 19 (7.6) | 47 (9.4) |
| Implant | 0 | 1 (0.4) | 1 (0.2) |
Note: Totals may not add up to 100% due to rounding.
Abbreviations: BMI, body mass index; SD, standard deviation.