Table 1. Cohort Characteristics Before Matching, MarketScan Research Databases 2008-2017.
| Characteristic | Control pool, person-years (%) | Participants with cases, No. (%) |
|---|---|---|
| Total | 31 343 467 (100) | 312 404 (100) |
| Age, y | ||
| 55-64 | 20 477 450 (65.3) | 65 891 (21.1) |
| 65-74 | 6 858 386 (21.9) | 85 824 (27.5) |
| 75-84 | 3 233 025 (10.3) | 108 734 (34.8) |
| ≥85 | 774 606 (2.5) | 51 955 (16.6) |
| Mean (SD) | 64.4 (8.4) | 74.9 (10.3) |
| Region | ||
| Northeast | 4 829 594 (15.4) | 60 734 (19.4) |
| North Central | 8 686 649 (27.7) | 96 413 (30.9) |
| South | 12 154 200 (38.8) | 102 207 (32.7) |
| West | 5 673 024 (18.1) | 53 050 (17.0) |
| Hypertension | 16 689 204 (53.3) | 203 463 (65.1) |
| Anemia | 1 209 904 (3.9) | 20 197 (6.5) |
| Charlson Comorbidity Index score | ||
| 0 | 20 333 344 (64.9) | 154 732 (49.5) |
| 1 | 5 305 055 (16.9) | 63 305 (20.3) |
| 2 | 3 377 497 (10.8) | 47 842 (15.3) |
| ≥3 | 2 327 571 (7.4) | 46 525 (14.9) |
| Mean (SD) | 0.69 (1.22) | 1.10 (1.50) |
| Years in study | ||
| 2008-2011 | 11 428 666 (36.5) | 107 706 (34.5) |
| 2012-2014 | 10 930 937 (34.9) | 119 020 (38.1) |
| 2015-2017 | 8 983 864 (28.7) | 85 678 (27.4) |