High-risk status† (v. low risk) | 1.22 (1.08–1.38) |
Smoking during pregnancy (v. no smoking) | 0.81 (0.71–0.94) |
Single, widowed or divorced (v. married or common law) | 0.83 (0.07–0.94) |
Multiparous (v. primiparous) | 0.87 (0.78–0.96) |
Rural residence (v. urban) | 1.18 (1.06–1.32) |