Table 4.
Multivariate Cox Semiparametric Regression Analysis of Risk Predictors of Measles Immunoglobulin G Protective Antibody Survival
| Determinants | Multivariate Analysis | |
|---|---|---|
| aHR (95% CI) | P Value | |
| Sex (male vs female) | 1.12 (.88–1.42) | .370 |
| Age, y, at enrollment | .61 (.51–.87) | < .0001 |
| Age at the first dose of routine MMR vaccine | ||
| ≤15 mo (baseline) | 1.00 | |
| 16–23 mo | 1.24 (.93–1.64) | .141 |
| ≥24 mo | 4.08 (2.82–5.90) | < .0001 |
| Age, y, at the second dose of routine MMR vaccine | .67 (.51–.87) | .003 |
| Time, mo, from the second dose of MMR vaccine to the antibody titer evaluation | .99 (.95–.99) | .005 |
Abbreviations: aHR, adjusted hazard ratio; CI, confidence interval; MMR, measles-mumps-rubella.