Table 3.
Odds ratios for weekend and off-hour effects on cerebral palsy for normal spontaneous delivery
| Variable | Bivariate | Model 1 | Model 2 |
|---|---|---|---|
| Perinatal care centers | |||
| Comprehensive | 1.00 | 1.00 | 1.00 |
| Regional | 2.65, 1.66–4.21 | 2.69, 1.69–4.30 | 2.92, 1.76–4.84 |
| Day | |||
| Weekday | 1.00 | 1.00 | 1.00 |
| Weekend | 1.20, 0.76–1.91 | 1.17, 0.73–1.88 | 1.63, 0.97–2.73 |
| Shift | |||
| Day | 1.00 | 1.00 | 1.00 |
| Quasi-night | 1.44, 0.85–2.44 | 1.51, 0.89–2.58 | 1.65, 0.93–2.95 |
| Night | 1.04, 0.62–1.75 | 1.00, 0.59–1.71 | 1.26, 0.70–2.27 |
| Hosmer–Lemeshow test | P = 0.075 | P = 0.897 | |
Data are expressed as odds ratios and 95% confidence intervals with logistic regression models
Cases: N = 90, controls: N = 900; covariates: (Model 3) birth year; (Model 4) adding birth year, prescription of prostaglandin, prescription of oxytocin, maternal age, parity, pregnancy-induced hypertension, preterm labor, gestational week, and standard deviation for birth weight