Univariate logistic regression analyses of the effects of maternal occupational exposure during pregnancy on time to pregnancy (>6 months), preterm birth (<37 weeks) and decreased birth weight (<3000 g) among women in a birth cohort study
| Occupational exposure | n | Prolonged time to pregnancy (n=3719), OR (95% CI) | Preterm birth (n=6302), OR (95% CI) | Decreased birth weight (n=6201), OR (95% CI) |
| Self-reported occupational exposure | ||||
| Manual materials handling ≥5 kg | 580 | 0.74 (0.57 to 0.97)* | 0.43 (0.26 to 0.72)* | 0.66 (0.52 to 0.84)* |
| Manual materials handling ≥25 kg | 68 | 1.17 (0.56 to 2.44) | 0.48 (0.12 to 1.98) | 1.43 (0.82 to 2.50) |
| Prolonged sitting | 2758 | 0.90 (0.77 to 1.04) | 0.94 (0.76 to 1.17) | 0.96 (0.84 to 1.09) |
| Prolonged standing | 871 | 1.01 (0.81 to 1.25) | 0.86 (0.62 to 1.18) | 1.12 (0.94 to 1.34) |
| Pesticides | 43 | 1.23 (0.48 to 3.18) | 1.27 (0.39 to 4.11) | 1.19 (0.57 to 2.50) |
| Anaesthetic gases, cytostatics | 127 | 1.17 (0.73 to 1.88) | 0.66 (0.27 to 1.62) | 0.74 (0.45 to 1.22) |
| Heavy metals | 38 | 1.53 (0.65 to 3.60) | 0.89 (0.21 to 3.72) | 1.75 (0.86 to 3.55) |
| Industrial solvents | 218 | 1.22 (0.81 to 1.83) | 1.02 (0.58 to 1.81) | 1.35 (0.98 to 1.86)** |
| Common household cleaning materials | 937 | 1.08 (0.87 to 1.33) | 0.72 (0.52 to 1.00)** | 0.94 (0.79 to 1.13) |
| Dry cleaning (tetrachloroethylene or trichlroethylene) | 43 | 0.97 (0.39 to 2.43) | 0.78 (0.19 to 3.24) | 1.06 (0.49 to 2.32) |
| Ionising radiation | 108 | 0.79 (0.44 to 1.40) | 0.30 (0.07 to 1.32) | 1.04 (0.64 to 1.68) |
| Job–exposure matrix approach | ||||
| Possible exposure to | ||||
| Pesticides | 32 | 2.04 (0.73 to 5.76) | 1.67 (0.51 to 5.52) | 2.40 (1.14 to 5.05)* |
| Anaesthetic gases, cytostatics | 57 | 0.98 (0.46 to 2.09) | 1.22 (0.44 to 3.39) | 1.06 (0.54 to 2.05) |
| Heavy metals | 27 | 0.41 (0.09 to 1.78) | 1.20 (0.28 to 5.05) | 1.12 (0.46 to 2.78) |
| Solvents | 227 | 1.23 (0.83 to 1.83) | 1.15 (0.67 to 1.96) | 1.21 (0.88 to 1.66) |
| Phthalates | 117 | 1.51 (0.92 to 2.47) | 1.19 (0.58 to 2.45) | 1.15 (0.73 to 1.80) |
| Alkylphenolic compounds | 233 | 1.33 (0.90 to 1.96) | 0.79 (0.43 to 1.47) | 1.20 (0.88 to 1.65) |
| Probable exposure to | ||||
| Pesticides | 32 | 2.04 (0.73 to 5.76) | 1.67 (0.51 to 5.52) | 2.40 (1.14 to 5.05)* |
| Anaesthetic gases, cytostatics | 48 | 1.20 (0.55 to 2.60) | 1.47 (0.53 to 4.12) | 1.15 (0.57 to 2.32) |
| Heavy metals | 27 | 0.44 (0.10 to 1.92) | 1.29 (0.31 to 5.48) | 1.24 (0.50 to 3.09) |
| Solvents | 69 | 1.96 (1.10 to 3.49)* | 1.55 (0.66 to 3.59) | 1.05 (0.58 to 1.90) |
| Phthalates | 41 | 2.70 (1.31 to 5.55)* | 1.28 (0.39 to 4.15) | 0.71 (0.30 to 1.68) |
| Alkylphenolic compounds | 185 | 1.11 (0.70 to 1.76) | 0.72 (0.35 to 1.48) | 1.36 (0.96 to 1.92)** |