Do parental heights influence pregnancy length?: a population-based prospective study, HUNT 2

Table 8 Odds ratio (OR) for preterm delivery and post- term delivery by paternal height ¹

	Preterm delivery (< 37.0) weeks					Post term delivery (>42.0 weeks)
Paternal height (in quintiles)	Cases/non-cases	Crude estimate²	Adjusted estimate³	95% CI	p for trend	Cases/non- cases	Crude estimate²	Adjusted estimate³	95% CI	p for trend
	Estimated date of delivery based on US
≤ 175	24/479	1.0	1.0	Ref		27/477	1.0	1.0	Ref
176-178	26/371	1.4	1.5	0.8,2.8		29/368	1.4	1.3	0.7,2.3
179-181	24/388	1.2	1.4	0.7,2.6		22/390	1.0	0.9	0.5,1.7
182-185	18/430	0.8	1.0	0.5,2.1		32/416	1.4	1.2	0.7,2.1
≥186	21/378	1.1	1.4	0.7,2.6	0.16	23/376	1.1	0.9	0.5,1.7	0.70
	Estimated date of delivery based on LMP
≤ 175	33/609	1.0	1.0	Ref		87/555	1.0	1.0	Ref
176-178	23/473	0.9	0.9	0.5,1.8		66/430	1.0	1.0	0.7,1.4
179-181	27/487	1.0	1.1	0.7,2.0		54/460	0.8	0.7	0.5,1.1
182-185	27/525	0.9	1.1	0.7,2.1		67/485	0.9	0.8	0.6,1.2
≥186	28/484	1.1	1.2	0.8,2.2	0.24	55/357	0.8	0.7	0.5,1.1	0.11

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 HUNT 2 participation. ³Additionally adjusted for maternal height, maternal age at birth, duration between baseline ( HUNT 2 participation) and delivery, maternal education, parity, smoking, receiving social security benefits or not, pre-pregnancy maternal hypertension, diabetes mellitus, kidney and heart disease, BMI, systolic and diastolic blood pressure, blood concentration of glucose and lipids.

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