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Effectiveness of vaccines in pneumococcal pneumonia in age-related subsets. OR, odds ratio; CI, confidence interval; PPSV23, 23-valent pneumococcal polysaccharide vaccine. The lower adjusted ORs in subsets of older patients were estimated, suggesting that the PPSV23 can be more effective for older patients. The adjusted OR was adjusted using the quantile category of propensity scores
