Table 3. Age-specific neonatal and child mortality rates* in the northern and southern regions of Nigeria.
| Age | Northern region Estimate (95% CI) | Southern region Estimate (95% CI) | Total Estimate (95% CI) | Ratio NMR / SMR Estimate (95% CI) | Z, p-value± |
|---|---|---|---|---|---|
| Neonates (days) | |||||
| 0–6 | 32.3 (29.9, 34.7) | 30.2 (27.4, 33.1) | 31.6 (29.8, 33.5) | 1.1 (0.9, 1.2) | 1.0, 0.307 |
| 7–27 | 6.5 (3.6, 9.3) | 5.1 (0.7, 9.5) | 6.0 (3.5, 8.5) | 1.3 (0.3, 4.7) | 0.4, 0.727 |
| Total neonatesβ | 38.5 (34.9, 42.1) | 35.2 (30, 40.5) | 37.5 (34.3, 40.5) | 1.1 (0.9, 1.3) | 1.0, 0.316 |
| 1–59 month olds (months) | |||||
| 1–5 | 16.4 (14.2, 18.5) | 13.9 (10.8, 16.9) | 15.6 (13.8, 17.3) | 1.2 (0.9, 1.5) | 1.3, 0.204 |
| 6–11 | 18.5 (16.0, 21.1) | 13.3 (10.2, 16.4) | 16.9 (14.9, 18.9) | 1.4 (1.1, 1.8) | 2.4, 0.016 |
| 12–23 | 30.7 (24.4, 34.0) | 18.2 (14.5, 21.9) | 26.8 (24.1, 29.4) | 1.7 (1.3, 2.1) | 4.5, < 0.001 |
| 24–59 | 46.6 (41.5, 51.7) | 15.0 (11.4, 18.7) | 36.9 (32.9, 40.8) | 3.1 (2.4, 4.1) | 8.2, < 0.001 |
| Total 1–59 month oldsβ | 107.9 (99.7, 116.0) | 59.0 (51.7, 66.4) | 92.9 (86.5, 99.2) | 1.8 (1.6, 2.1) | 8.0, < 0.001 |
*All mortality rates are calculated from the NDHS birth history data for the same prior 5-year period as the VASA deaths
±Equivalence tested with an observed Z statistic, with a normal approximation using the bootstrap of survey primary sampling units [35]
βTotal neonatal mortality rate per 1,000 live births; Total 1–59 month mortality rate, calculated as: 1-((1-U5MR)/(1-NMR)); Each age-specific rate estimated directly from the cohort that survived to that age.