Table 3

Mean differences in length of pregnancy by maternal height1
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

1Pregnancy length according to estimated date of delivery (EDD) by ultrasound (US) (4038 pregnancies) and by first day of last menstrual period (LMP) (4846pregnancies). 2Adjusted for maternal age at baseline (HUNT 2 participation). 3Additionally adjusted for maternal age at birth, duration between Hunt 2 participation and delivery, maternal education, parity, maternal smoking, receiving social security benefits or not, and fetal sex. 4Additionally adjusted for pre-pregnancy, hypertension, diabetes mellitus, kidney and heart disease, BMI; systolic and diastolic blood pressure, concentration of glucose and lipids.

Myklestad et al.

Myklestad et al. BMC Pregnancy and Childbirth 2013 13:33   doi:10.1186/1471-2393-13-33

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