Demographics of women in both groups. Figures shown are number (%) except for age
| Demographic | Double-window LSPT (n=492) | Single-window LSPT (n=555) |
| Age range (years) | 16–47 | 16–47 |
| Mean (SD) | 26.7 (6.7) | 27.0 (6.7) |
| Gestation (days) | ||
| <49 | 345 (70) | 383 (69) |
| 50–56 | 89 (18) | 108 (19) |
| 57–63 | 57 (12) | 64 (12) |
| >64 | 1 (0.2) | 0 (0) |
| Reproductive history | ||
| Previous birth | 210 (43) | 207 (37) |
| Previous abortion | 158 (32) | 190 (34) |
| Previous miscarriage | 54 (11) | 51 (18) |
| Previous ectopic | 0 (0) | 4 (0.8) |
LSPT, low-sensitivity pregnancy text.