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Table 3 Mean differences in length of pregnancy by maternal height 1

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

  1. 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.