Trends in dementia incidence rates (/1000) for every 5-year age group and gender from 2000 to 2021
| Summary | Trends | ||||||
| Year 2000 (n/YCG) | Year 2021 (n/YCG) | AAPC (95% CI) | Years APC (95% CI) | ||||
| Incidence all ages (age adjusted) | |||||||
| Total (n=3835) | 3.68 (67/16654) | 5.86 (398/52700) | 1.8 (−2.0 to 5.7) | 2000 to 2015 0.8 (−0.5 to 2.0) | 2015–2018 18.5 (−10.0 to 56.2) | 2018–2021 −8.1 (−14.8 to −0.8) | |
| Female (n=2478) | 4.01 (45/9608) | 6.29 (249/29083) | 1.5 (−2.6 to 5.8) | 2000 to 2015 0.2 (−1.1 to 1.6) | 2015–2018 20.0 (−11.0 to 61.7) | 2018–2021 −8.7 (−15.9 to −0.9) | |
| Male (n=1357) | 3.4 (22/7046) | 5.39 (149/23617) | 3.3 (2.2 to 4.5) | ||||
| Incidence 65–69 years | |||||||
| Total (n=177) | 1.06 (5/4728) | 0.97 (14/14461) | −0.2 (−1.8 to 1.5) | ||||
| Women (n=99) | 0.79 (2/2530) | 1.07 (8/7462) | 0.1 (−2.8 to 3.1) | ||||
| Men (n=78) | 1.36 (3/2198) | 0.86 (6/6999) | −1.4 (−4.2 to 1.5) | ||||
| Incidence 70–74 years | |||||||
| Total (n=398) | 1.15 (5/4361) | 2.67 (33/12343) | 0.7 (−1.1 to 2.5) | ||||
| Women (n=246) | 1.67 (4/2394) | 3.10 (20/6448) | 0.4 (−1.7 to 2.6) | ||||
| Men (n=152) | 0.51 (1/1967) | 2.21 (13/5895) | 0.6 (−1.9 to 3.1) | ||||
| Incidence 75–79 years | |||||||
| Total (n=726) | 3.97 (14/3527) | 5.68 (54/9501) | 2.5 (0.8 to 4.3) | ||||
| Women (n=462) | 4.94 (10/2023) | 6.75 (34/5039) | 0 (−9.1 to 10.0) | 2000 to 2015 0.1 (−2.7 to 3.1) | 2015–2018 23.6 (−37.8 to 145.7) | 2018–2021 −19.8 (−35.3 to −0.7) | |
| Men (n=264) | 2.66 (4/1504) | 4.48 (20/4462) | 2.9 (0 to 5.8) | ||||
| Incidence 80–84 years | |||||||
| Total (n=1 038) | 6.71 (13/1938) | 14.30 (103/7204) | 2.4 (−3.8 to 9.0) | 2000 to 2016 1.0(−1.3:3.3) | 2016–2019 22.7 (−19.2 to 86.2) | 2019–2021 −12.5 (−34.8 to 17.6) | |
| Women (n=647) | 9.16 (11/1201) | 15.57 (65/4176) | 3.3 (1.8 to 4.9) | ||||
| Men (n=391) | 2.71 (2/737) | 12.55 (38/3028) | 4.5 (2.2 to 6.9) | ||||
| Incidence 85–89 years | |||||||
| Total (n=959) | 15.60 (21/1346) | 21.07 (112/5316) | 3.9 (2.1 to 5.8) | ||||
| Women (n=637) | 14.72 (13/883) | 20.48 (67/3272) | 4.5 (2.5 to 6.5) | ||||
| Men (n=322) | 17.28 (8/463) | 22.02 (45/2044) | 2.7 (0.6 to 4.9) | ||||
| Incidence 90+ years | |||||||
| Total (n=537) | 11.94 (9/754) | 21.16 (82/3875) | 3.6 (−2.2 to 9.7) | 2000 to 2010 3.0 (−0.8 to 7.0) | 2010–2014 −20.6 (−36.7 to −0.5) | 2014–2018 52.7 (22.2 to 90.7) | 2018–2021 −10.4 (−18.2 to −1.8) |
| Women (n=387) | 8.67 (5/577) | 20.48 (55/2686) | 3.5 (−3.4 to 10.8) | 2000 to 2010 4.5 (−0.1 to 9.4) | 2010–2014 −23.3 (−41.0 to −0.3) | 2014–2018 54.5 (17.5 to 103.1) | 2018–2021 −12.6 (−22.2 to −1.8) |
| Men (n=150) | 22.60 (4/177) | 22.71 (27/1189) | 5.8 (2.3 to 9.4) | ||||
Note: the year period intervals for the APCs change because of the nature of the joinpoint regression, which seeks intervals in which a change of trend can be observed, thus the intervals can be different across different strata.
(A)APC, (average) annual percentage change; YCG, yearly contact group.