Table 4.
Multivariable logistic regression analyses for preterm birth, low infant birth weight and APGAR score < 7 at 1 and 5 min for singleton pregnancies in 2010–2015 (n = 140,569)
| Beta | SE | Wald | P | Odds ratio | Lower 95% CI | Upper 95% CI | |
|---|---|---|---|---|---|---|---|
|
1) Preterm birth Missing cases: 4.8% | |||||||
| Age < 18 | − 0.17 | 0.07 | 5.14 | 0.023 | 0.85 | 0.74 | 0.98 |
| Age > 35 | 0.32 | 0.02 | 177.67 | < 0.001 | 1.38 | 1.32 | 1.45 |
| BMI < 18.5 | 0.44 | 0.05 | 66.35 | < 0.001 | 1.55 | 1.39 | 1.72 |
| BMI > 25 | 0.00 | 0.02 | 0.00 | 0.978 | 1.00 | 0.97 | 1.04 |
| Current alcohol use | −0.09 | 0.10 | 0.87 | 0.352 | 0.91 | 0.76 | 1.10 |
| Current smoking | 0.36 | 0.02 | 244.97 | < 0.001 | 1.44 | 1.38 | 1.51 |
| Fetal abnormality in pregnancy | 1.93 | 0.08 | 532.92 | < 0.001 | 6.89 | 5.85 | 8.12 |
| Hypertensive disorder in pregnancy | 1.55 | 0.04 | 1487.49 | < 0.001 | 4.69 | 4.34 | 5.08 |
| Lone parent | 0.05 | 0.04 | 1.83 | 0.176 | 1.05 | 0.98 | 1.12 |
| Maternal employment | −0.19 | 0.02 | 81.18 | < 0.001 | 0.83 | 0.80 | 0.87 |
| New antenatal disclosure of intimate partner violence | 0.32 | 0.22 | 2.08 | 0.149 | 1.38 | 0.89 | 2.12 |
| Self-reported mental disorder | 0.27 | 0.02 | 151.92 | < 0.001 | 1.31 | 1.25 | 1.37 |
|
2) Low infant birth weight Missing cases: 4.9% | |||||||
| Age < 18 | −0.15 | 0.10 | 2.15 | 0.143 | 0.87 | 0.71 | 1.05 |
| Age > 35 | 0.31 | 0.04 | 64.48 | < 0.001 | 1.36 | 1.26 | 1.47 |
| BMI < 18.5 | 0.73 | 0.07 | 116.80 | < 0.001 | 2.07 | 1.81 | 2.36 |
| BMI > 25 | −0.28 | 0.03 | 100.11 | < 0.001 | 0.76 | 0.71 | 0.80 |
| Current alcohol use | 0.03 | 0.13 | 0.06 | 0.811 | 1.03 | 0.80 | 1.33 |
| Current smoking | 0.93 | 0.03 | 845.05 | < 0.001 | 2.54 | 2.39 | 2.71 |
| Fetal abnormality in pregnancy | 2.67 | 0.09 | 891.55 | < 0.001 | 14.49 | 12.16 | 17.27 |
| Hypertensive disorder in pregnancy | 2.03 | 0.05 | 1714.25 | < 0.001 | 7.64 | 6.94 | 8.41 |
| Lone parent | 0.22 | 0.05 | 21.08 | < 0.001 | 1.24 | 1.13 | 1.36 |
| Maternal employment | −0.22 | 0.03 | 48.44 | < 0.001 | 0.81 | 0.76 | 0.86 |
| New antenatal disclosure of intimate partner violence | 0.62 | 0.26 | 5.66 | 0.017 | 1.86 | 1.12 | 3.12 |
| Self-reported mental disorder | 0.26 | 0.03 | 62.04 | < 0.001 | 1.29 | 1.21 | 1.38 |
|
3) APGAR score < 7 at 1 min Missing cases: 5.2% | |||||||
| Age < 18 | 0.27 | 0.06 | 17.78 | < 0.001 | 1.31 | 1.16 | 1.49 |
| Age > 35 | −0.01 | 0.03 | 0.26 | 0.609 | 0.99 | 0.94 | 1.04 |
| BMI < 18.5 | −0.10 | 0.06 | 2.72 | 0.099 | 0.90 | 0.80 | 1.02 |
| BMI > 25 | 0.19 | 0.02 | 127.74 | < 0.001 | 1.21 | 1.17 | 1.26 |
| Current alcohol use | −0.02 | 0.10 | 0.03 | 0.861 | 0.98 | 0.82 | 1.18 |
| Current smoking | −0.05 | 0.02 | 4.58 | 0.032 | 0.95 | 0.91 | 1.00 |
| Fetal abnormality in pregnancy | 1.63 | 0.09 | 334.30 | < 0.001 | 5.09 | 4.27 | 6.06 |
| Hypertensive disorder in pregnancy | 0.34 | 0.05 | 51.73 | < 0.001 | 1.41 | 1.28 | 1.55 |
| Lone parent | 0.22 | 0.03 | 43.10 | < 0.001 | 1.24 | 1.16 | 1.32 |
| Low infant birth weight | 1.08 | 0.04 | 905.38 | < 0.001 | 2.93 | 2.73 | 3.15 |
| Maternal employment | 0.03 | 0.02 | 2.25 | 0.133 | 1.03 | 0.99 | 1.07 |
| New antenatal disclosure of intimate partner violence | −0.07 | 0.25 | 0.08 | 0.781 | 0.93 | 0.57 | 1.52 |
| Preterm birth | 0.42 | 0.03 | 236.12 | < 0.001 | 1.52 | 1.44 | 1.60 |
| Self-reported mental disorder | 0.13 | 0.02 | 37.44 | < 0.001 | 1.14 | 1.10 | 1.19 |
|
4) APGAR score < 7 at 5 min Missing cases: 5.2% | |||||||
| Age < 18 | −0.06 | 0.15 | 0.17 | 0.685 | 0.94 | 0.70 | 1.26 |
| Age > 35 | −0.05 | 0.05 | 0.73 | 0.392 | 0.96 | 0.86 | 1.06 |
| BMI < 18.5 | −0.01 | 0.12 | 0.01 | 0.919 | 0.99 | 0.78 | 1.25 |
| BMI > 25 | 0.18 | 0.04 | 22.19 | < 0.001 | 1.19 | 1.11 | 1.28 |
| Current alcohol use | 0.22 | 0.18 | 1.45 | 0.228 | 1.24 | 0.87 | 1.78 |
| Current smoking | −0.04 | 0.05 | 0.64 | 0.426 | 0.96 | 0.87 | 1.06 |
| Fetal abnormality in pregnancy | 2.41 | 0.10 | 556.73 | < 0.001 | 11.15 | 9.13 | 13.62 |
| Hypertensive disorder in pregnancy | −0.02 | 0.09 | 0.04 | 0.840 | 0.98 | 0.82 | 1.18 |
| Lone parent | 0.23 | 0.07 | 11.19 | 0.001 | 1.25 | 1.10 | 1.43 |
| Low infant birth weight | 1.50 | 0.06 | 688.59 | < 0.001 | 4.48 | 4.00 | 5.01 |
| Maternal employment | 0.04 | 0.04 | 0.98 | 0.323 | 1.04 | 0.96 | 1.14 |
| New antenatal disclosure of intimate partner violence | −0.04 | 0.47 | 0.01 | 0.941 | 0.97 | 0.38 | 2.44 |
| Preterm birth | 0.95 | 0.05 | 355.79 | < 0.001 | 2.59 | 2.34 | 2.85 |
| Self-reported mental disorder | 0.21 | 0.05 | 20.61 | < 0.001 | 1.23 | 1.12 | 1.34 |
SE Standard error, CI Confidence interval