Table 1.
Levels of antibodies against diphtheria toxoid and pertussis toxin in the all participants and according to age groups.
| Parameter | Age groups |
|||
|---|---|---|---|---|
| 19–36 mo | 37–55 mo | P | ||
| Anti-PT IgG titer (IU/ml); No. (%); (95% CI) | ||||
| No. of subjects | 78 | 41 | 37 | |
| >25 | 20 (25.64) (17.26–36.31) | 15 (36.58) (23.59–51.88) | 5 (13.51) (5.91–27.98) | 0.020 |
| GMT | 12.02 (10.80–13.24) | 17.78 (16.63–18.92) | 14.79 (13.65–15.93) | 0.020 |
| Anti-DT IgG titer (IU/ml); No. (%); (95% CI) | ||||
| No. of subjects | 81 | 44 | 37 | |
| ≥0.01 | 81 (100) (95.47–100) | 44 (100) (91.97–100) | 37 (100) (90.59–100) | |
| ≥0.1 | 76 (93.83) (86.35–97.33) | 43 (97.73) (88.19–99.60) | 33 (89.19) (75.29–95.71) | 0.173 |
| ≥1 | 18 (22.22) (14.54–32.42) | 13 (29.54) (18.16–44.22) | 5 (13.51) (5.91–27.98) | 0.084 |
| GMT | 0.55 (0.44–0.65) | 0.66 (0.51–0.81) | 0.44 (0.29–0.59) | 0.535 |