Table 3. Relationship between crude and effective coverage of measles immunization.
| Mexico | |||
| Crude coverage 1 | DBS effective coverage | ||
| Yes | No | Total | |
| Yes | 59.8% | 14.2% | 74.0% |
| No | 9.3% | 16.7% | 26.0% |
| Total | 69.1% | 30.9% | 100% |
| Parameters | |||
| Sample size | 895 | ||
| Kappa | 0.43 (0.39–0.46) | ||
| % agreement | 76.5 (73.7–79.3) | ||
| % sensitivity | 86.6 (84.4–88.8) | ||
| % specificity | 54.0 (50.8–57.3) | ||
| Positive predictive value | 80.8 (78.2–83.4) | ||
| Negative predictive value | 64.3 (61.2–67.5) | ||
| Nicaragua | |||
| Crude coverage 1 | DBS effective coverage | ||
| Yes | No | Total | |
| Yes | 46.7% | 35.4% | 82.2% |
| No | 3.7% | 14.2% | 17.8% |
| Total | 50.7% | 49.6% | 100% |
| Parameters | |||
| Sample size | 299 | ||
| Kappa | 0.21 (0.10–0.33) | ||
| % agreement | 60.9 (55.4–66.4) | ||
| % sensitivity | 92.8 (88.8–96.7) | ||
| % specificity | 28.6 (20.8–36.3) | ||
| Positive predictive value | 56.9 (50.8–63.0) | ||
| Negative predictive value | 79.5 (68.0–91.1) | ||
Table restricted to children with both health card and DBS sources; excluding children with DBS collection within 28 days of vaccination. Estimates are survey weighted.
1 Crude coverage: according to child health card.