Table 3.
Mortality rate and hazard rate (HR) for children from 3 months of age until first examination without vaccination or 6 months of age. Natural experiment.
| Age group 3–5 months |
Mortality rate (deaths/person-years) | HR (95% CI) for DTP vs unvaccinated | ||
|---|---|---|---|---|
| All | ||||
| Unvaccinated (N = 651) |
4.5 (5/111.4) | DTP (± OPV) (N = 462) | 17.4 (11/63.1) | 5.00 (1.53–16.3) |
| DTP only (N = 101) | 35.2 (5/14.2) | 10.0 (2.61–38.6) | ||
| DTP + OPV (N = 361) | 12.3 (6/48.9) | 3.52 (0.96–12.9) | ||
| Girls | ||||
| Unvaccinated (N = 313) |
1.9 (1/51.9) | DTP (± OPV) (N = 222) | 13.3 (4/30.1) | 9.98 (0.81–123.0) |
| DTP only (N = 44) | 16.2 (1/6.2) | 12.0 (0.56–257.2) | ||
| DTP + OPV (N = 178) | 12.5 (3/23.9) | 9.50 (0.73–124.0) | ||
| Boys | ||||
| Unvaccinated (N = 338) |
6.7 (4/59.5) | DTP (± OPV) (N = 240) | 21.2 (7/33.0) | 3.93 (1.01–15.3) |
| DTP only (N = 57) | 49.8 (4/8.0) | 8.93 (2.01–39.7) | ||
| DTP + OPV (N = 183) | 12.0 (3/24.9) | 2.21 (0.44–11.0) | ||
Notes: There were no deaths due accidents in this age group. BCG is disregarded in the analysis. Hence, the unvaccinated children have not received DTP, OPV or MV but may have received BCG. Of the 651 unvaccinated children, 219 received DTP and/or OPV before their first weighing examination. These children counted as ‘unvaccinated’ until their first weighing examination. Of the 462 children who received DTP (± OPV), 177 received an additional DTP or OPV before 6 months of age. The OPV-only is not presented in the table because there were no deaths and very little follow-up time in this age group.