The relative burden of community-acquired pneumonia hospitalizations in older adults: a retrospective observational study in the United States

Table 6 Study cohort attrition. Describes the cohort select process and total number of inclusions and exclusions

Cohort Selection Step	Subjects remaining (N, %)		Subjects excluded (N,%)
1. All Medicare patients enrolled in Optum DOD between Jan 1, 2014 and Dec 31, 2015	3,971,785	100.000
2. (1) and Medicare beneficiaries aged 65–89 years as of 1/1/2015	3,533,736	88.971	438,049	11.029
3. (2) and with continuous medical/pharmacy eligibility from 1/1/2014–12/31/2015 or death if occurs in 2015	1,993,580	50.194	1,540,156	38.777
4. (3) and excluding members with hospitalization for CAP, MI, stroke or OF during 2014	1951,510	49.134	42,070	1.059
5. (4) and excluding members with a cumulative stay ≥90 days in skilled nursing facility or long-term care during 2014	1,949,352	49.080	2158	0.054
Final study sample	1,949,352

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