Physically demanding work | N | SGA (n=201) | Preterm birth (n=231) | Low birth weight (n=203) | |||
OR (95% CI) unadjusted | OR (95% CI) adjusted† | OR (95% CI) unadjusted | OR (95% CI) adjusted† | OR (95% CI) unadjusted | OR (95% CI) adjusted‡ | ||
Long periods of standing | |||||||
No | 2435 | Reference | Reference | Reference | Reference | Reference | Reference |
Occasionally | 918 | 1.49 (1.06 to 2.11)* | 1.34 (0.94 to 1.92) | 0.83 (0.57 to 1.20) | 0.78 (0.53 to 1.15) | 1.20 (0.84 to 1.73) | 1.65 (1.02 to 2.64)* |
Often | 881 | 1.04 (0.70 to 1.54) | 0.95 (0.63 to 1.45) | 1.03 (0.72 to 1.46) | 0.95 (0.65 to 1.40) | 1.00 (0.68 to 1.47) | 1.02 (0.60 to 1.73) |
Long periods of walking | |||||||
No | 2129 | Reference | Reference | Reference | Reference | Reference | Reference |
Occasionally | 1461 | 1.19 (0.86 to 1.65) | 1.09 (0.78 to 1.53) | 1.12 (0.83 to 1.53) | 1.07 (0.78 to 1.46) | 1.16 (0.84 to 1.60) | 1.08 (0.70 to 1.67) |
Often | 664 | 1.40 (0.94 to 2.08) | 1.22 (0.79 to 1.89) | 0.96 (0.63 to 1.46) | 0.85 (0.54 to 1.33) | 0.96 (0.61 to 1.50) | 0.86 (0.46 to 1.60) |
Lifting >25 kg | |||||||
No | 3981 | Reference | Reference | Reference | Reference | Reference | Reference |
Occasionally | 217 | 2.11 (1.27 to 3.50)* | 2.41 (1.43 to 4.08)* | 1.26 (0.71 to 2.25) | 1.26 (0.70 to 2.26) | 1.21 (0.65 to 2.25) | 1.31 (0.60 to 2.85) |
Often | 70 | 1.79 (0.71 to 4.51) | 1.85 (0.70 to 4.88) | 0.58 (0.14 to 2.39) | 0.55 (0.13 to 2.28) | 1.01 (0.32 to 3.25) | 1.86 (0.44 to 7.77) |
Nightshifts | |||||||
No | 4069 | Reference | Reference | Reference | Reference | Reference | Reference |
Occasionally | 137 | 1.74 (0.90 to 3.37) | 1.69 (0.86 to 3.33) | 0.90 (0.39 to 2.07) | 0.87 (0.38 to 2.01) | 1.04 (0.45 to 2.39) | 1.78 (0.64 to 4.96) |
Often | 60 | 0.76 (0.19 to 3.15) | 0.73 (0.17 to 3.08) | 1.41 (0.51 to 3.92) | 1.29 (0.46 to 3.65) | 1.62 (0.58 to 4.52) | 1.23 (0.28 to 5.41) |
Work hours | |||||||
1–24 h/week | 1191 | Reference | Reference | Reference | Reference | Reference | Reference |
25–39 h/week | 2214 | 1.38 (0.94 to 2.02) | 1.19 (0.79 to 1.77) | 1.44 (1.01 to 2.05)* | 1.29 (0.89 to 1.87) | 1.51 (1.03 to 2.21)* | 1.25 (0.75 to 2.09) |
>40 h/week | 1084 | 1.65 (1.09 to 2.52)* | 1.29 (0.81 to 2.05) | 1.58 (1.06 to 2.35)* | 1.32 (0.85 to 2.03) | 1.73 (1.14 to 2.64)* | 1.20 (0.66 to 2.18) |
↵* p Value <0.05.
↵† Adjusted for maternal age, height at intake, weight before pregnancy, educational level, ethnicity, parity, smoking, alcohol use, folic acid supplement use, self-perceived health and fetal gender.
↵‡ Adjusted for maternal age, height at intake, weight before pregnancy, educational level, ethnicity, parity, smoking, alcohol use, folic acid supplement use, gestational age at birth, self-perceived health and fetal gender.