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.