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The base value of PPSV23 effectiveness against NPP was assumed as 0%, and sensitivity analysis was conducted by varying the value from 20% to 50%, as presented in the 2x2 table. (PPSV23, 23-valent pneumococcal polysaccharide vaccine; PCV13, 13-valent pneumococcal conjugate vaccine; IPD, invasive pneumococcal disease; NPP, non-bacteremic pneumococcal pneumonia).
