Results were similar using propensity analysis where participants with pneumonia were matched to those without pneumonia based on age , probability of developing pneumonia , and similar trajectories of cognitive and physical function prior to pneumonia ( adjusted prevalence rates , 91.7 vs 65 cases per 1,000 person-years ; adjusted prevalence rate ratio = 1.6 ; CI , 1.06-2 .7 ; p = 0.03 ) .