Table 4.
Poliovirus Seronegativity Among Children Aged 6–12 Months, by Number of Type-Specific Doses
| Vaccine, No. of Doses | Patients, No. | No. Negative | Percentage Negative (95% CI) | P Valuea |
|---|---|---|---|---|
|
| ||||
| tOPV | <.001 | |||
| 0 | 58 | 54 | 93.1 (83.6–97.3) | |
| 1 | 29 | 19 | 65.5 (47.3–80.1) | |
| 2 | 29 | 16 | 55.2 (37.5–71.6) | |
| ≥3 | 53 | 13 | 24.5 (14.9–37.6) | |
| OPV3 | <.001 | |||
| 0 | 21 | 18 | 85.7 (65.4–95.0) | |
| 1 | 15 | 9 | 60.0 (35.7–80.2) | |
| 2 | 37 | 28 | 75.7 (59.9–86.6) | |
| 3 | 38 | 22 | 57.9 (42.2–72.1) | |
| 4 | 24 | 11 | 45.8 (27.9–64.9) | |
| ≥5 | 35 | 11 | 31.4 (18.6–48.0) | |
Abbreviations: CI, confidence interval; OPV3, oral polio vaccine type 3; tOPV, trivalent oral polio vaccine.
a
By the Cochran-Armitage trend test.