Table 2 Association of factors measured in early pregnancy on duration of gestation among women with spontaneous delivery (preterm, term or postterm)
From: Physical fitness, serum relaxin and duration of gestation
Simple linear regression | Multiple linear regression R2 = 0.07, p < 0.0001 | ||||
|---|---|---|---|---|---|
Variable | Estimate | R2 | p= | Estimate | p= |
Age (yr) | 0.26 | 0.00 | 0.05 | 0.20 | 0.12 |
Weight (kg) | 0.04 | 0.00 | 0.33 | ||
Height (m) | 12.1 | 0.00 | 0.22 | ||
Number of deliveries | −0.53 | 0.00 | 0.48 | ||
Number of pregnancies | −0.30 | 0.00 | 0.56 | ||
University education (no/yes) | 0.01 | 0.00 | 0.98 | ||
Current smoking (no/yes) | −0.80 | 0.00 | 0.40 | ||
Absolute \( \dot{V}{O}_2 \) peak, est. (l/min) | 3.2 | 0.02 | 0.004 | 2.33 | 0.04 |
Serum relaxin (ng/l) | 0.00 | 0.00 | 0.11 | 0.00 | 0.48 |
Multiple pregnancy (no/yes) | −25.2 | 0.06 | <0.0001 | −24.5 | <0.0001 |