TABLE 4.
Dementia incidence by age.
| No. of person-years | No. of new all-cause dementia cases (crude) | All-cause dementia incidence ratea (95% CI) (per 1,000 person-years) | No. of new AD dementia cases (crude) | AD dementia incidence ratea (95% CI) (per 1,000 person-years) | |||||||||||
| Total | Male | Female | Total | Male | Female | Total | Male | Female | Total | Male | Female | Total | Male | Female | |
| All age | 8558143 | 3897537 | 4660606 | 49524 | 14980 | 34544 | 6.16 (6.03–6.30) | 3.92 (3.76–4.09) | 8.16 (7.97–8.37) | 32949 | 9557 | 23392 | 4.17 (4.06–4.28) | 2.54 (2.41–2.67) | 5.62 (5.46–5.79) |
| 45–49 | 680317.7 | 332120.7 | 348197 | 16 | 11 | 5 | 0.00 (0.00–0.01) | 0.01 (0.00–0.01) | 0.00 (0.00–0.01) | 7 | 5 | 2 | 0.00 (0.00–0.00) | 0.00 (0.00–0.01) | 0.00 (0.00–0.00) |
| 50–54 | 1577858 | 768229.6 | 809628.4 | 212 | 116 | 96 | 0.02 (0.02–0.03) | 0.03 (0.02–0.03) | 0.02 (0.02–0.02) | 107 | 59 | 48 | 0.01 (0.01–0.01) | 0.01 (0.01–0.02) | 0.01 (0.01–0.01) |
| 55–59 | 1867539 | 897487.3 | 970052 | 759 | 371 | 388 | 0.07 (0.07–0.08) | 0.08 (0.07–0.09) | 0.07 (0.06–0.08) | 433 | 192 | 241 | 0.04 (0.04–0.05) | 0.04 (0.04–0.05) | 0.04 (0.04–0.05) |
| 60–64 | 1391240 | 658621.9 | 732617.7 | 1492 | 691 | 801 | 0.15 (0.14–0.16) | 0.15 (0.14–0.16) | 0.15 (0.14–0.16) | 903 | 384 | 519 | 0.09 (0.09–0.10) | 0.08 (0.08–0.09) | 0.10 (0.09–0.11) |
| 65–69 | 1095942 | 500143.1 | 595798.9 | 3420 | 1430 | 1990 | 0.31 (0.30–0.32) | 0.28 (0.27–0.30) | 0.33 (0.31–0.34) | 2161 | 883 | 1278 | 0.19 (0.19–0.20) | 0.17 (0.16–0.19) | 0.21 (0.20–0.22) |
| 70–74 | 854618.7 | 364243.6 | 490375.1 | 7477 | 2671 | 4806 | 0.65 (0.64–0.67) | 0.52 (0.50–0.54) | 0.76 (0.74–0.78) | 4693 | 1640 | 3053 | 0.41 (0.40–0.42) | 0.32 (0.31–0.34) | 0.48 (0.47–0.50) |
| 75–79 | 579088.9 | 221986 | 357103 | 11717 | 3700 | 8017 | 1.34 (1.31–1.36) | 0.96 (0.93–0.99) | 1.66 (1.62–1.70) | 7549 | 2333 | 5216 | 0.86 (0.84–0.88) | 0.60 (0.58–0.63) | 1.08 (1.05–1.11) |
| 80–84 | 370403.4 | 118762.1 | 251641.2 | 12182 | 3320 | 8862 | 1.32 (1.30–1.35) | 0.84 (0.81–0.87) | 1.75 (1.71–1.79) | 8205 | 2191 | 6014 | 0.89 (0.87–0.91) | 0.55 (0.53–0.58) | 1.19 (1.16–1.22) |
| 85– | 141135.4 | 35942.62 | 105192.8 | 12249 | 2670 | 9579 | 2.29 (2.25–2.33) | 1.06 (1.02–1.10) | 3.42 (3.36–3.49) | 8891 | 1870 | 7021 | 1.66 (1.63–1.70) | 0.74 (0.71–0.78) | 2.51 (2.45–2.57) |
CI, confidence interval; AD, Alzheimer’s disease.
aAdjusted for age and sex.