Table 2.
Logistic and Cox’s regression results of the effects of selected characteristics on C-section: Overall cases
| Selected variables | Results of logistic regression analysis | Results of Cox’s regression analysis | ||
|---|---|---|---|---|
| Odds ratio [Exp (β)] | 95 % CI | Hazard ratio [Exp (β)] | 95 % CI | |
| Fetal Distress | ||||
| (No) | 1.00 | 1.00 | ||
| Yes | 1.08 | 0.67–1.76 | 1.01* | 0.52–1.51 |
| Previous C-section | ||||
| (No) | 1.00 | 1.00 | ||
| Yes | 20.18* | 10.46–25.58 | 9.80* | 7.11–12.36 |
| Multiple Birth | ||||
| (No) | 1.00 | 1.00 | ||
| Yes | 1.12 | 0.35–3.58 | 1.01 | 0.54–2.78 |
| Pregnancy-Induced Breathing Difficulty | ||||
| (No) | 1.00 | 1.00 | ||
| Yes | 1.06 | 0.55–2.03 | 1.02 | 0.45–2.35 |
| Prolonged Labour | ||||
| (No) | 1.00 | 1.00 | ||
| Yes | 0.17* | 0.12–0.23 | 0.95 | 0.45–1.89 |
| Mother’s Education | ||||
| (Primary and below) | 1.00 | 1.00 | ||
| Secondary | 2.19* | 1.55–3.11 | 1.15 | 0.57–2.47 |
| Higher | 2.68* | 1.58–4.54 | 1.53 | 0.78–2.41 |
| Mother’s Age: years | ||||
| (<20) | 1.00 | 1.00 | ||
| 20–24 | 1.39 | 0.92–2.11 | 1.12* | 0.75–2.31 |
| 25–29 | 2.74* | 1.58–4.72 | 1.48* | 0.85–2.59 |
| 30+ | 5.07* | 2.31–11.12 | 2.05* | 1.02–3.52 |
| Age at Marriage: years | ||||
| (<18) | 1.00 | 1.00 | ||
| 18–22 | 0.93 | 0.64–1.35 | 0.57* | 0.31–1.95 |
| 23+ | 1.06 | 0.54–2.05 | 1.01* | 0.54–2.01 |
| Order of Birth | ||||
| (1) | 1.00 | 1.00 | ||
| 2 | 0.74* | 0.49–1.12 | 0.43* | 0.16–1.57 |
| 3+ | 0.33 | 0.17–0.64 | 0.28 | 0.07–1.47 |
| Length of Baby: cm | ||||
| (<45) | 1.00 | 1.00 | ||
| 45+ | 1.45* | 1.04–2.02 | 1.07 | 0.45–2.07 |
| Weight of Baby: kg | ||||
| (<2.5) | 1.00 | 1.00 | ||
| 2.5+ | 0.74 | 0.54–1.02 | 0.49 | 0.17–1.31 |
| Head Circumferences: cm | ||||
| (<32) | 1.000 | 1.00 | ||
| 32+ | 1.084 | 0.76–1.54 | 1.02 | 0.57–1.89 |
| Residence | ||||
| (Rural) | 1.00 | 1.00 | ||
| Urban | 0.854 | 0.61–1.91 | 0.51 | 0.28–1.18 |
| Ever had a Child Aborted | ||||
| (No) | 1.00 | 1.00 | ||
| Yes | 0.57 | 0.25–1.33 | 0.34 | 0.16–1.51 |
| Duration of Taking Balance Diet | ||||
| (Often) | 1.00 | 1.00 | ||
| Once a week | 1.45* | 0.95–2.22 | 1.20 | 0.54–2.22 |
| Rarely | 1.87* | 1.24–2.81 | 1.45 | 0.69–2.07 |
| Intercept | −0.25 | −2 log likelihood | 13765.19 | |
| −2 log likelihood | 2997.81 | Modelchi-square | 398.94* | |
| Cox &Snell R2 | 0.54 | Degrees of freedom | 21 | |
| Nagelkerke R2 | 0.57 | |||
| AIC | 3031.82 | AIC | 13799.19 | |
* P < 0.05, significant risk factors in the model; CI = confidence interval; parentheses indicate the reference categories