Table 2.
Cox's multivariate regression analysis of duration of postpartum amenorrhoea
| Variable | Coefficient (β) | Wald test (p value) | Relative risk (eβ) | 95% CI for eβ |
|---|---|---|---|---|
| Demographic | ||||
| Duration (months) of breastfeeding | -0.015 | 11.703, p<0.01 | 0.985 | 0.976-0.994 |
| Age (years) at marriage of wife | 0.011 | 1.588, p>0.05 | 1.011 | 0.994-1.029 |
| Parity | -0.027 | 2.393, p>0.05 | 0.973 | 0.940-1.007 |
| Sex of previous child | -0.003 | 0.003, p>0.05 | 0.997 | 0.890-1.117 |
| Survival status of previous child | -0.538 | 8.167, p<0.01 | 0.584 | 0.390-0.845 |
| Use of contraceptives | -0.008 | 0.011, p>0.05 | 0.992 | 0.859-1.146 |
| Socioeconomic | ||||
| Place of residence | -0.180 | 5.710, p<0.05 | 0.835 | 0.721-0.968 |
| Educational level of husband | 0.004 | 0.313, p>0.05 | 1.004 | 0.989-1.019 |
| Educational level of wife | -0.005 | 0.465, p>0.05 | 0.995 | 0.980-1.010 |
| Family income (Rs) | 0.000 | 0.727, p>0.05 | 0.999 | 0.998-1.001 |
CI=Confidence interval