Demographics of participants
| Continued to run during pregnancy | Never ran during pregnancy | |
| Age (on 1 December 2014) (n, mean, SD) | 712, 37.5, 6.4 | 576, 40, 42.5 |
| Height (m) (n, mean, SD) | 694, 1.66, 0.1 | 572, 1.65, 0.1 |
| Weight (kg) (n, mean, SD) | 708, 62.6, 9.5 | 576, 65.6, 12.1 |
| BMI (kg/m2), (n, mean, SD) | 690, 22.7, 3.0 | 570, 24.1, 4.1 |
| <18.5 (underweight), n (%) | 30 (4.3) | 15 (2.6) |
| 18.5–24.9 (normal range), n (%) | 536 (77.8) | 367 (64.4) |
| 25–29.9 (overweight), n (%) | 106 (15.4) | 154 (27) |
| 30+ (obese), n (%) | 18 (2.6) | 34 (6.0) |
| Ethnicity (non-white), n (%) | 19 (2.7) | 19 (3.3) |
BMI, body mass index.