Table 1 Baseline characteristics of the linked electronic health records-Medicare cohort

N

50,083

57,610

61,301

63,492

101,980

Demographics

Age, years, Median (Quartile 1, Quartile 3)

71.0 (67.0, 77.0)

72.0 (67.0, 77.0)

72.0 (68.0, 78.0)

72.0 (68.0, 78.0)

70.0 (66.0, 76.0)

Age categories

 50–64

19,847 (39.6%)

22,091 (38.3%)

22,669 (37.0%)

22,399 (35.3%)

46,392 (45.5%)

 65–74

12,668 (25.3%)

14,698 (25.5%)

16,170 (26.4%)

17,375 (27.4%)

24,022 (23.6%)

 75–84

8,644 (17.3%)

10,079 (17.5%)

10,909 (17.8%)

11,775 (18.5%)

15,781 (15.5%)

 85 + 

8,924 (17.8%)

10,742 (18.6%)

11,553 (18.8%)

11,943 (18.8%)

15,785 (15.5%)

Sex, Female

29,188 (58.3%)

33,482 (58.1%)

35,527 (58.0%)

36,657 (57.7%)

58,517 (57.4%)

Race/Ethnicity

 White

37,615 (75.1%)

43,751 (75.9%)

46,518 (75.9%)

48,406 (76.2%)

76,772 (75.3%)

 Black

10,504 (21.0%)

11,471 (19.9%)

12,037 (19.6%)

12,081 (19.0%)

20,574 (20.2%)

 Other

1,964 (3.9%)

2,388 (4.1%)

2,746 (4.5%)

3,005 (4.7%)

4,634 (4.5%)

Dual Medicaid Eligibility

10,050 (20.1%)

10,754 (18.7%)

10,938 (17.8%)

10,854 (17.1%)

20,336 (19.9%)

Rural location

13,898 (27.7%)

14,712 (25.5%)

15,196 (24.8%)

15,440 (24.3%)

27,935 (27.4%)

State

 North Carolina

48,785 (97.4%)

56,140 (97.4%)

59,773 (97.5%)

61,871 (97.4%)

98,683 (96.8%)

 South Carolina

1,298 (2.6%)

1,470 (2.6%)

1,528 (2.5%)

1,621 (2.6%)

3,297 (3.2%)