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Efficacy by age groups. The efficacy was tested using linear mixed modeling (β coefficient was not standardized).
| Age (years) | Estimate (SE) | t testa (df) | P value |
| 18-24 | 3.43291 (0.16118) | 21.298 (2073.5) | <.001 |
| 25-34 | 3.35234 (0.11098) | 30.206 (1656.2) | <.001 |
| 35-44 | 3.72108 (0.10826) | 34.370 (1604.7) | <.001 |
| 45-54 | 3.12995 (0.13658) | 22.916 (1894.7) | <.001 |
| >55 | 3.76299 (0.15390) | 24.251 (2242.4) | <.001 |
aTests were two-tailed.
