Baseline demographic, obstetric and sleep habit characteristics
| PrenaBelt-then-sham (n=10) | Sham-then-PrenaBelt (n=10) | |
| Age (years) | 31.1 (6.0) | 30.7 (4.1) |
| Caucasian ethnicity | 6 (60%) | 10 (100%) |
| Prepregnancy BMI (kg/m2) | 27.0 (3.3) | 26.2 (3.5) |
| Current BMI (kg/m2) | 30.9 (3.7) | 29.9 (3.6) |
| Gestational age (weeks) | 30.9 (3.0) | 30.8 (2.8) |
| Gravida | ||
| 1 | 4 (40%) | 6 (60%) |
| ≥2 | 6 (60%) | 4 (40%) |
| Sleep duration (hours) | 8.0 (7.5–8.0) | 7.8 (7.0–8.0) |
| In the last week | ||
| Sleep-onset positions | ||
| Left | 7 (70%) | 10 (100%) |
| Supine | 3 (30%) | 2 (20%) |
| Right | 8 (80%) | 3 (30%) |
| Prone | 1 (10%) | 0 (0%) |
| Waking positions: | ||
| Left | 8 (80%) | 4 (40%) |
| Supine | 4 (40%) | 4 (40%) |
| Right | 5 (50%) | 6 (60%) |
| Prone | 0 (0%) | 0 (0%) |
| When not pregnant | ||
| Sleep-onset positions: | ||
| Left | 2 (20%) | 3 (30%) |
| Supine | 3 (30%) | 3 (30%) |
| Right | 2 (20%) | 4 (40%) |
| Prone | 7 (70%) | 6 (60%) |
| Waking positions: | ||
| Left | 5 (50%) | 4 (40%) |
| Supine | 4 (40%) | 7 (70%) |
| Right | 5 (50%) | 2 (20%) |
| Prone | 5 (50%) | 4 (40%) |
| Snores ≥3 nights per week | 4 (40%) | 3 (30%) |
| Sleeps with bed partner | 7 (70%) | 10 (100%) |
| Pillow use | ||
| Under head | 9 (90%) | 9 (90%) |
| Between knees | 8 (80%) | 6 (60%) |
| Behind back | 3 (30%) | 5 (50%) |
| Under tummy | 3 (30%) | 4 (40%) |
| Pregnancy pillow | 4 (40%) | 1 (10%) |
Normally distributed continuous variables are reported as mean (SD). Non-normally distributed continuous variables are presented as median (IQR). Count data are presented as frequency (%).
Percentages for responses to some questions may add to greater than 100% because some participants checked more than one box in response to a question, for example, for sleep-onset position in the last week, some responded ‘left’ and ‘right’.
BMI, body mass index.