Table 3.
Age-specific prevalence of diphtheria immunity
| Age groups (years) | Susceptibility (<0.01 IU/ml) |
Basic protection (0.01-0.1 IU/ml) |
Full protection (>0.1 IU/ml) |
P-Value+ | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Total | N | % | 95%CI | N | % | 95%CI | N | % | 95%CI | ||
| 0-5 | 82 | 26 | 31.7 | 21.9-42.9 | 4 | 4.9 | 1.3-12.0 | 52 | 63.4 | 52.0-73.8 | <0,001* |
| 6-10 | 233 | 78 | 33.5 | 27.4-39.9 | 9 | 3.8 | 1.8-7.2 | 146 | 62.7 | 56.1-68.9 | |
| 11-20 | 457 | 159 | 34.8 | 30.4-39.4 | 31 | 6.8 | 4.6-9.5 | 267 | 58.4 | 53.7-62.9 | |
| 21-30 | 449 | 198 | 44.1 | 39.5-48.8 | 20 | 4.5 | 2.7-6.8 | 231 | 51.4 | 46.7-56.2 | |
| 31-40 | 378 | 153 | 40.5 | 35.5-45.6 | 25 | 6.6 | 4.3-9.6 | 200 | 52.9 | 47.7-58.0 | |
| 41-50 | 239 | 84 | 35.1 | 29.1-41.5 | 20 | 8.4 | 5.2-12.6 | 135 | 56.5 | 49.9-62.8 | |
| 51-60 | 190 | 61 | 32.1 | 25.5-39.2 | 12 | 6.3 | 3.3-10.7 | 117 | 61.6 | 54.3-68.5 | |
| >60 | 197 | 43 | 21.8 | 16.3-28.2 | 15 | 7.6 | 4.3-12.2 | 139 | 70.6 | 63.6-76.8 | |
+ using Pearson Chi-Square
* denote statistical significance