Table 4 An evaluation of the impact of the age of MMR vaccine administration on the effectiveness of the vaccine to prevent cases of measles
Model | Variable | Hazard Ratio (95% CI) | VE (95% CI) | p-value | χ2 |
|---|---|---|---|---|---|
I | Vaccinateda vs Unvaccinatedb (≥ 12 months-old) | 0.147 (0.071 to 0.305) | 85.3% (69.5 to 92.9%) | < 0.0001 | 26.5 |
Vaccinated vs Unvaccinated (≥ 16 months-old) | 0.100 (0.036 to 0.273) | 90% (72.7 to 86.4%) | < 0.0001 | 20.2 | |
Vaccinated vs Unvaccinated (≥ 20 months-old) | 0.061 (0.015 to 0.247) | 93.9% (75.3 to 98.5%) | < 0.0001 | 15.3 | |
II | Vaccinated vs Unvaccinated (≥ 12 months-old) | 0.173 (0.083 to 0.360) | 82.7% (64 to 91.7%) | < 0.0001 | 22.1 |
Gender (Female vs Male) | 1.032 (0.673 to 1.584) | 0.89 | 0.02 | ||
County of Residence | 0.994 (0.983 to 1.005) | 0.27 | 1.20 | ||
Date of Birth | 0.999 (0.999 to 0.999) | < 0.0001 | 30 | ||
Vaccinated vs Unvaccinated (≥ 16 months-old) | 0.111 (0.040 to 0.303) | 88.9% (69.7 to 96%) | < 0.0001 | 18.4 | |
Gender (Female vs Male) | 1.109 (0.718 to 1.715) | 0.64 | 0.22 | ||
County of Residence | 0.995 (0.984 to 1.007) | 0.42 | 0.66 | ||
Date of Birth | 0.999 (0.999 to 0.999) | < 0.0001 | 28.1 | ||
Vaccinated vs Unvaccinated (≥ 20 months-old) | 0.070 (0.017 to 0.287) | 93% (71.3 to 98.3%) | < 0.0001 | 13.7 | |
Gender (Female vs Male) | 1.027 (0.658 to 1.602) | 0.91 | 0.01 | ||
County of Residence | 0.996 (0.985 to 1.008) | 0.49 | 0.47 | ||
Date of Birth | 0.999 (0.999 to 1.000) | < 0.0001 | 27.4 |