Outcome | Â | Bivariate | Multivariate |
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 | N | Odds Ratio | 95% CI | P | Odds Ratio | 95% CI P |
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Preterm <37 weeks a
| 648 | 0.92 | 0.59, 1.43 | 0.710 | 0.92 | 0.58, 1.46 | 0.732 |
Normal birth a,b
| 648 | 1.61 | 1.17, 2.20 | 0.003* | 1.48 | 1.07, 2.06 | 0.019* |
NICU admission a,c
| 643 | 0.71 | 0.47, 1.06 | 0.100 | 0.70 | 0.45, 1.08 | 0.110 |
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a Adjusted for maternal age, parity, body mass index, smoking, medical complications (gestational diabetes, antepartum haemorrhage, pregnancy induced hypertension, asthma) and socio-economic status as measured by the Socio-Economic Indexes of Areas.
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b Normal birth defined as: spontaneous onset of labour, no epidural, non-instrumental vaginal birth and no episiotomy.
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c Excluding stillbirths CI Confidence Interval. * Statistically significant.