Table 2. Number of doses of diphtheria vaccine received by diphtheria case-patients and matched controls, Hyderabad, India, 2006*.
| No. doses received | Case-patients |
Controls |
Odds ratio estimate | Vaccine efficacy estimate, % (95% CI) | |||||
|---|---|---|---|---|---|---|---|---|---|
| <5 y of age | >5 y of age | Total | <5 y of age | >5 y of age | Total | ||||
| 0 | 6 | 20 | 26 | 2 | 11 | 13 | Reference | Reference | |
| 1 | 0 | 7 | 7 | 1 | 2 | 3 | 1.4 (0.22–8.9) | 0 (0–78) | |
| 2 | 2 | 6 | 8 | 0 | 2 | 2 | 2.1 (0.37–12) | 0 (0–63) | |
| 3 | 6 | 34 | 40 | 8 | 26 | 34 | 0.51 (0.20–1.3) | 49 (0–80) | |
| 4† | 7 | 27 | 34 | 10 | 30 | 40 | 0.35 (0.13–92) | 65 (8–87) | |
| 5‡ | NA | 8 | 8 | NA | 31 | 31 | 0.09 (0.02–0.33) | 91§ (68–98) | |
*Conditional logistic regression taking into account vaccine doses, religion, family income, and parental literacy. CI, confidence interval; NA, not applicable. †Booster at 18 mo of age. ‡Booster at 5 y of age. §Vaccine efficacy among children >5 y of age; younger children could not have received that booster.