| Variables | Pooled (1992-2006) | |||
| HR | p value | 95.0% CI for HR | ||
| Lower | Upper | |||
| Breastfeeding | ||||
| No+ | ||||
| Yes | 0.03 | 0.00 | 0.029 | 0.033 |
| Place of residence | ||||
| Rural+ | ||||
| Urban | 0.82 | 0.00 | 0.762 | 0.887 |
| Mothers age at birth | ||||
| 20 - 34+ | 0.07 | |||
| 15 - 19 | 1.07 | 0.08 | 0.993 | 1.153 |
| 35+ | 1.10 | 0.09 | 0.986 | 1.225 |
| Mother’s education | ||||
| Illiterate+ | 0.00 | |||
| Less than 8 years completed | 0.93 | 0.08 | 0.856 | 1.009 |
| 8 years complete and above | 0.66 | 0.00 | 0.600 | 0.728 |
| Mother’s occupation | ||||
| Non gainful occupation+ | ||||
| Gainful occupation | 0.91 | 0.00 | 0.892 | 0.926 |
| Birth interval since last birth | ||||
| First birth/preceding birth interval ≥ 2 years+ | ||||
| Preceding birth interval < 2 years | 1.06 | 0.08 | 0.993 | 1.130 |
| Antenatal & natal care | ||||
| No+ | ||||
| Yes | 1.03 | 0.44 | 0.956 | 1.109 |
| Size of the child | ||||
| Large/average+ | ||||
| Small | 1.40 | 0.00 | 1.322 | 1.493 |
| Standard of living Index | ||||
| Low+ | ||||
| Medium/high | 0.96 | 0.21 | 0.894 | 1.025 |
| States | ||||
| Low PNMR states+ | 0.00 | |||
| Medium PNMR states | 1.23 | 0.00 | 1.112 | 1.371 |
| High PNMR states | 1.46 | 0.00 | 1.327 | 1.609 |
| Time | ||||
| NFHS 1 (1992-1993) | ||||
| NFHS 3 (2005-2006) | 0.82 | 0.00 | 0.759 | 0.879 |