Table 5.
Trimester-specific associations with birth weight (in grams, continuous variable) (n = 8,879). Statistically significant variables (P < 0.05) emerging from the univariate analyses (see Table 2) were entered in the final model
| Effect size (βa): unadjusted | Effect size (βa): adjusted | 95% CI | P value | |
|---|---|---|---|---|
| 1st trimester | ||||
| Sitting | −38.4 | −21.4 | −39.3, −3.5 | 0.019 |
| Standing | −10.4 | −15.6 | −33.6, 2.3 | 0.088 |
| 2nd trimester | ||||
| Sitting 2nd and 3rd trim | −37.1 | −21.6 | −39.6, −3.7 | 0.018 |
| In paid work | −43.7 | −17.9 | −32.0, −3.9 | 0.009 |
| Night shifts | 52.1 | 27.6 | 11.8, 43.5 | <0.001 |
| 3rd trimester | ||||
| Bend and stoop | 130.8 | 37.8 | 20.3, 55.3 | <0.001 |
| Night shifts | 71.6 | 91.4 | −15.0, 197.8 | 0.092 |
aBeta (regression coefficient) and CI 95% confidence interval