TABLE 2.
Dementia prevalence and incidence rates for all Medicare beneficiaries.
| Prevalence | Incidence | |||
|---|---|---|---|---|
| N | % | N | % | |
| Overall | 2,463,051 | 7.92 (7.91 to 7.93) | 702,829 | 2.77 (2.77 to 2.78) |
| Age group | ||||
| 65 to 69 | 140,504 | 1.84 (1.83 to 1.85) | 40,191 | 0.80 (0.79 to 0.80) |
| 70 to 74 | 296,055 | 3.37 (3.36 to 3.38) | 102,316 | 1.29 (1.28 to 1.29) |
| 75 to 79 | 440,099 | 6.96 (6.94 to 6.98) | 136,942 | 2.42 (2.41 to 2.43) |
| 80 to 84 | 539,178 | 13.07 (13.04 to 13.10) | 152,151 | 4.34 (4.32 to 4.36) |
| 85 to 89 | 545,801 | 21.03 (20.98 to 21.08) | 143,972 | 7.05 (7.02 to 7.09) |
| 90+ | 501,414 | 31.02 (30.95 to 31.09) | 127,257 | 11.14 (11.08 to 11.19) |
| Sex | ||||
| Male (ref) | 835,929 | 6.52 (6.51 to 6.54) | 259,381 | 2.47 (2.46 to 2.48) |
| Female | 1,627,122 | 7.60 (7.59 to 7.61) | 443,448 | 2.65 (2.64 to 2.66) |
| Race | ||||
| White (ref) | 1,839,921 | 7.70 (7.69 to 7.71) | 536,764 | 2.73 (2.72 to 2.73) |
| Black | 255,458 | 10.85 (10.81 to 10.89) | 66,172 | 3.65 (3.62 to 3.67) |
| Hispanic | 258,196 | 9.97 (9.93 to 10.00) | 68,032 | 3.31 (3.29 to 3.34) |
| Asian | 76,222 | 7.19 (7.14 to 7.24) | 21,983 | 2.55 (2.51 to 2.58) |
| American Indian/Alaska Native | 7079 | 9.67 (9.46 to 9.88) | 2195 | 3.74 (3.59 to 3.89) |
| Missing/Other | 26,175 | 7.47 (7.41 to 7.53) | 7683 | 2.59 (2.55 to 2.63) |
Note. This table presents dementia prevalence (Columns 1 and 2) and incidence (Columns 3 and 4) rates for all Medicare beneficiaries for the year 2017. These beneficiaries were continuously enrolled in year t and year t+1. Dementia in year t is verified with dementia diagnosis code or dementia symptom code or drug code or death in year t+1. Rates by sex and race were age‐adjusted to reference group.