Associations between changing exercise levels during pregnancy and birth weight and neonatal adiposity
| Crude | Multivariable* | |||||
| Decreased | Unchanged | Increased | Decreased | Unchanged | Increased | |
| Change in exercise level in pregnancy to 15 weeks, coefficient (95% CI) | ||||||
| Birth weight (g)† | 54.39 (−4.16 to 112.93) | (reference) | 70.24 (−80.40 to 220.89) | 22.03 (−37.61 to 81.67) | (reference) | 74.40 (−75.84 to 224.64) |
| Neonatal adiposity (%)† | 0.03 (−0.49 to 0.55) | (reference) | 0.19 (−1.15 to 1.53) | 0.01 (−0.52 to 0.55) | (reference) | 0.33 (−1.01 to 1.67) |
| Adiposity<10th centile‡ | 1.12 (0.70 to 1.80) | (reference) | 0.97 (0.28 to 3.36) | 1.20 (0.73 to 1.95) | (reference) | 0.82 (0.23 to 2.94) |
| Adiposity>90th centile‡ | 0.93 (0.62 to 1.39) | (reference) | 1.62 (0.67 to 3.90) | 0.96 (0.62 to 1.41) | (reference) | 1.75 (0.71 to 4.31) |
| Change in exercise level in pregnancy: 15–20 weeks, coefficient (95% CI) | ||||||
| Birth weight (g)† | 54.47 (−11.96 to 120.90) | (reference) | 50.11 (−15.53 to 115.75) | 42.68 (−23.62 to 108.98) | (reference) | 22.30 (−43.49 to 88.09) |
| Neonatal adiposity (%)† | 0.54 (−0.05; to 1.13) | (reference) | 0.18 (−0.40 to 0.76) | 0.56 (−0.03 to 1.15) | (reference) | 0.13 (−0.46 to 0.72) |
| Adiposity<10th centile‡ | 0.94 (0.56 to 1.56) | (reference) | 0.64 (0.36 to 1.14) | 0.94 (0.56 to 1.59) | (reference) | 0.69 (0.39 to 1.24) |
| Adiposity>90th centile‡ | 1.62 (1.07 to 2.46) | (reference) | 0.81 (0.49 to 1.33) | 1.66 (1.09 to 2.54) | (reference) | 0.80 (0.48 to 1.32) |
*Adjusted for: socioeconomic status, years of schooling, employment status, maternal body mass index, smoking in first trimester, alcohol intake in first trimester, maternal age and exercise as part of job.
†Linear regression for continuous outcomes (β).
‡Logistic regression for dichotomous outcomes (OR).