Table 5

Mean differences in length of pregnancy by paternal height1
Difference in pregnancy length (days)
Crude estimate2 Adjusted for obstetric and socioeconomic factors3 Additional adjustment for maternal cardiovascular risk factors4
Paternal 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
≤ 175 503 0 0 Ref 0 Ref
176-178 397 0.2 −0.2 −2.0,1.7 −0.5 −2.4,1.4
179-181 448 −0.1 −0.6 −2.4,1.3 −0.8 −2.6,1.1
182-185 412 0.6 −0.5 −2.2,1.6 −0.8 −2.7,1.1
≥186 399 0.5 −0.7 −2.5,1.0 0.43 −0.7 −2.5,1.0 0.39
Estimated date of delivery based on LMP
≤ 175 642 0 0 Ref 0 Ref
176-178 496 0.2 0.0 −1.9,1.9 −0.2 −2.0,1.7
179-181 514 0.2 −0.1 −1.9,1.6 −0.3 −2.0,1.5
182-185 552 −0.6 −1.2 −3.0,0.7 −1.4 −3.2,0.5
≥186 512 −0.3 −0.9 −2.7,0.9 0.17 −0.9 −2.7,0.9 0.16

1Pregnancy length according to date of delivery estimated by ultrasound (US) (2159 pregnancies) and by first day of last menstrual period (LMP) (2716 pregnancies). 2Adjusted for paternal age at baseline (HUNT 2 participation). 3Additionally adjusted for maternal height, 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 and maternal height.

Myklestad et al.

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

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