Table 1.
Mortality Incidence Rates for Community-living Participants in the 2011 and 2015 Cohorts According to Data Source and Censoring Approach a
| Data Source | 2011 Cohort | 2015 Cohort | ||||
|---|---|---|---|---|---|---|
| Number of deaths | Person-years of follow-up | Rates per 100-Person Years (95% CI) | Number of deaths | Person-years of follow-up | Rates per 100-Person Years (95% CI) | |
| Medicare data | 15,670,118 | 277,748,259 | 5.64 (5.45–5.84) | 8,447,402 | 18,387,2185 | 4.59 (4.38–4.82) |
| Sensitive files, censoring approach | ||||||
| Hybrid b | 9,682,036 | 193,051,231 | 5.02 (4.82–5.22) | 6,426,255 | 156,26,1842 | 4.11 (3.88–4.36) |
| Last completed interview | 9,682,036 | 175,552,164 | 5.52 (5.30–5.74) | 6,424,255 | 144,180,156 | 4.46 (4.20–4.73) |
Abbreviations: CI, confidence interval
Values are based on the baseline survey weights for the Medicare data and Sensitive files. The duration of follow-up was 10 years for the 2010 cohort and 5 years for the 2015 cohort. For the Sensitive files, participants who were lost to follow-up for reasons other than death were censored using two approaches described in the Methods. The mortality rates and 95% CIs were estimated using Poisson models including the logarithm of follow-up time as an offset, and survey weights and design were then incorporated via the R survey package.
Most participants were censored at time of last contact, while the remainder were censored at time of last completed interview, based on disposition codes of the tracker file for each annual interview, as shown in Supplementary Table S1.