| Crude | Adjusted | ||||
---|---|---|---|---|---|---|
Characteristic | OR | CI | p value | OR | CI | p value |
AA in early pregnancy (°) | 1.09 | 1.01-1.17 | 0.02 | 1.15 | 1.05-1.26 | 0.003 |
Age (yr) | 1.07 | 0.96-1.19 | 0.25 | 1.02 | 0.89-1.17 | 0.81 |
Body mass index (kg/m2) | 1.15 | 0.99-1.33 | 0.06 | 1.18 | 0.99.1.41 | 0.07 |
Cigarette smoking (%) | 0.48 | 0.12-1.92 | 0.30 | 0.22 | 0.04-1.28 | 0.09 |
No. of previous pregnancies | 2.34 | 1.37-3.98 | <0.0001 | 3.24 | 1.57-6.68 | 0.002 |
Previous back pain (%) | 0.59 | 0.21-1.67 | 0.32 | 0.68 | 0.21-2.20 | 0.52 |