From: Do parental heights influence pregnancy length?: a population-based prospective study, HUNT 2
Difference in pregnancy length (days) | ||||||||
---|---|---|---|---|---|---|---|---|
Crude estimate2 | Adjusted for obstetric and socioeconomic factors3 | Additional adjustment for maternal cardiovascular risk factors4 | ||||||
Maternal height (in quintiles) | N | Mean difference | Mean difference | 95% CI | p for trend | Mean difference | 95% CI | p for trend |
Estimated date of delivery based on US | ||||||||
<163 | 957 | 0 | 0 | Ref | 0 | Ref | ||
163-165 | 751 | 1.3 | 1.3 | −0.1,2.6 | 1.3 | 0.0,2.7 | ||
166-168 | 811 | 2.6 | 2.6 | 1.2,4.0 | 2.6 | 1.2,4.0 | ||
169-172 | 856 | 3.4 | 3.4 | 2.1,4.8 | 3.4 | 2.0,4.7 | ||
173+ | 663 | 4.3 | 4.3 | 2.9,5.6 | <0.0001 | 4.3 | 3.0,5.7 | <0.0001 |
Estimated date of delivery based on LMP | ||||||||
<163 | 1148 | 0 | 0 | Ref | 0 | Ref | ||
163-165 | 903 | 1.0 | 1.0 | −0.3,2.4 | 1.1 | −0.2,2.4 | ||
166-168 | 997 | 2.3 | 2.3 | 0.9,3.7 | 2.3 | 0.9,3.7 | ||
169-172 | 1021 | 2.2 | 2.3 | 1.0,3.6 | 2.3 | 1.0,3.6 | ||
173+ | 777 | 2.7 | 2.7 | 1.3,4.2 | <0.0001 | 2.8 | 1.3,4.2 | <0.0001 |