Table 2.
Age- and Sex-Specific Incidence Rates of Dementia (Per 1,000 Person-Years) in the Mayo Clinic Study of Aging, 2004–2013a
| Subgroup and Sex |
Age Range, years |
Total |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 70–74 |
75–79 |
80–84 |
85–89 |
||||||||||||
| No. | IR, % | 95% CI | No. | IR, % | 95% CI | No. | IR, % | 95% CI | No. | IR, % | 95% CI | No. | IR, % | 95% CI | |
| ACT group | |||||||||||||||
| Menb | 11 | 9.5 | 4.7, 17.0 | 18 | 15.0 | 8.9, 23.8 | 43 | 34.1 | 24.7, 45.9 | 26 | 53.0 | 34.6, 77.7 | 98 | 17.8 | 13.7, 23.1 |
| Womenc | 4 | 3.9 | 1.1, 10.1 | 13 | 12.4 | 6.6, 21.2 | 37 | 28.2 | 19.9, 38.9 | 32 | 46.3 | 31.7, 65.4 | 86 | 14.6 | 10.8, 19.7 |
| Both sexes | 15 | 5.9 | 3.2, 10.7 | 31 | 13.5 | 9.4, 19.4 | 80 | 30.2 | 24.0, 38.1 | 58 | 48.7 | 37.5, 63.2 | 184 | 15.9 | 12.9, 19.5 |
| ACT + PAS group | |||||||||||||||
| Mend | 21 | 15.6 | 9.6, 23.8 | 22 | 15.4 | 9.6, 23.3 | 57 | 36.8 | 27.9, 47.7 | 41 | 62.2 | 44.6, 84.4 | 141 | 21.6 | 17.5, 26.8 |
| Womene | 5 | 4.2 | 1.4, 9.9 | 22 | 18.0 | 11.3, 27.3 | 49 | 30.7 | 22.7, 40.6 | 45 | 49.8 | 36.4, 66.7 | 121 | 18.3 | 14.4, 23.2 |
| Both sexes | 26 | 7.6 | 4.5, 12.8 | 44 | 16.8 | 12.5, 22.6 | 106 | 32.8 | 26.8, 40.1 | 86 | 54.0 | 43.5, 67.1 | 262 | 19.6 | 16.6, 23.1 |
| REFUS groupf | |||||||||||||||
| Meng | 3 | 5.6 | 1.1, 16.2 | 12 | 26.1 | 13.9, 44.7 | 32 | 39.4 | 26.9, 55.6 | 25 | 62.6 | 40.5, 92.4 | 72 | 21.2 | 14.8, 30.2 |
| Womenh | 6 | 12.1 | 4.5, 26.4 | 11 | 23.7 | 11.9, 42.5 | 28 | 33.3 | 22.3, 47.8 | 33 | 51.4 | 35.4, 72.2 | 78 | 24.8 | 18.3, 33.6 |
| Both sexes | 9 | 8.6 | 4.4, 16.9 | 23 | 24.0 | 15.9, 36.3 | 60 | 34.9 | 26.7, 45.6 | 58 | 55.2 | 42.6, 71.6 | 150 | 23.2 | 18.4, 29.2 |
Abbreviations: ACT, active surveillance; CI, confidence interval; IR, incidence rate; PAS, passive surveillance; PY, person-years; REFUS, refusal.
a Incidence rates were directly standardized by age and sex to the Olmsted County, Minnesota, population on October 1, 2004, whenever it was applicable.
b Denominators were as follows (by age group): 70–74 years, 1,161 PY; 75–79 years, 1,198 PY; 80–84 years, 1,262 PY; 85–89 years, 491 PY.
c Denominators were as follows (by age group): 70–74 years, 1,013 PY; 75–79 years, 1,052 PY; 80–84 years, 1,312 PY; 85–89 years, 691 PY.
d Denominators were as follows (by age group): 70–74 years, 1,349 PY; 75–79 years, 1,430 PY; 80–84 years, 1,549 PY; 85–89 years, 659 PY.
e Denominators were as follows (by age group): 70–74 years, 1,179 PY; 75–79 years, 1,220 PY; 80–84 years, 1,594 PY; 85–89 years, 903 PY.
f The subset of nonparticipants who refused any participation.
g Denominators were as follows (by age group): 70–74 years, 540 PY; 75–79 years, 498 PY; 80–84 years, 813 PY; 85–89 years, 400 PY.
h Denominators were as follows (by age group): 70–74 years, 494 PY; 75–79 years, 464 PY; 80–84 years, 871 PY; 85–89 years, 642 PY.