Table 5.
Stepwise regression results of the effects of selected characteristics on C-section: Overall cases
| Results of logistic regression by stepwise selection | ||
|---|---|---|
| Most influential variables among selected variables | Odds ratio [Exp (β)] | 95 % CI |
| Prolonged Labour | ||
| (No) | 1.00 | |
| Yes | 0.17* | 0.12–0.23 |
| Previous C-section | ||
| (No) | 1.00 | |
| Yes | 20.53* | 10.23–24.92 |
| Mother’s Education | ||
| (Primary and below) | 1.00 | |
| Secondary | 2.04* | 1.49–3.01 |
| Higher | 2.50* | 1.48–4.31 |
| Mother’s Age: years | ||
| (<20) | 1.00 | |
| 20–24 | 1.35 | 0.82–1.82 |
| 25–29 | 2.85* | 1.42–4.12 |
| 30+ | 5.76* | 2.12–12.41 |
| Order of Birth | ||
| (1) | 1.00 | |
| 2 | 0.70 | 0.48–1.01 |
| 3+ | 0.31* | 0.12–0.58 |
| Duration of Taking Balance Diet | ||
| (Often) | 1.00 | |
| One day per week | 1.50* | 1.10–2.52 |
| Rarely | 1.87* | 1.32–2.85 |
| Length of Baby’s: cm | ||
| (<45) | 1.00 | |
| 45+ | 1.46* | 1.11–2.24 |
| Constant | 0.66* | 0.23–1.57 |
| Results of Cox’s regression by stepwise selection | ||
| Most influential variables among selected variables | Hazard ratio [Exp (β)] | 95 % CI |
| Mother’s Age: years | ||
| (<20) | 1.00 | |
| 20–24 | 1.32* | 1.10–3.23 |
| 25–29 | 1.55* | 1.21–2.51 |
| 30+ | 2.25* | 1.25–3.35 |
| Age at Marriage: years | ||
| (<18) | 1.00 | |
| 18–22 | 0.69* | 0.24–1.87 |
| 23+ | 1.10* | 0.54–2.56 |
| Order of Birth | ||
| (1) | 1.00 | |
| 2 | 0.40* | 0.21–1.36 |
| 3+ | 0.34* | 0.16–1.53 |
| Fetal Distress | ||
| (No) | 1.00 | |
| Yes | 1.21* | 0.69–2.14 |
| Abdominal Operation | ||
| (No) | 1.00 | |
| Yes | 10.20* | 3.28–18.62 |
* P < 0.05, significant risk factors in the model; CI = confidence interval; parentheses indicate the reference categories