Table 1.
Descriptive characteristics of the study populations
| Population based studies | |||||
| All (N = 19,035) | KP 1987–1998 (N = 1,692) | Harmony 1998–2002 (N = 12,120) | SATSA, OCTO-Twin, GENDER 1986–2010 (N = 1,913) | SNAC-K 2001–2010 (N = 3,310) | |
| Sex | |||||
| Men | 7734 (40.6) | 402 (23.8) | 5377 (44.4) | 786 (41.1) | 1169 (35.3) |
| Women | 11301 (59.4) | 1290 (76.2) | 6743 (55.6) | 1127 (58.9) | 2141 (64.7) |
| Age (mean, SD)1 | 74.7 (7.8) | 81.5 (4.9) | 73.9 (6.6) | 72.4 (10.7) | 74.5 (11.1) |
| Educational attainment2 | |||||
| Compulsory school | 9560 (51.0) | 889 (52.9) | 6874 (57.6) | 1278 (68.9) | 519 (15.8) |
| Any higher education | 9193 (49.0) | 789 (47.0) | 5065 (42.4) | 577 (31.1) | 2762 (84.2) |
| Dementia status | |||||
| Dementia -free participants | 17281 (90.8) | 1092 (64.5) | 11626 (95.9) | 1653 (86.4) | 2910 (87.9) |
| Prevalent dementia cases | 945 (5.0) | 211 (12.5) | 495 (4.1) | –3 | 240 (7.3) |
| Incident dementia cases | 809 (4.2) | 389 (23.0) | –3 | 260 (13.6) | 160 (4.8) |
| Men | 449 (25.6) | 106 (17.7) | 168 (34.0) | 100 (38.5) | 75 (18.7) |
| Women | 1305 (74.4) | 494 (82.3) | 326 (66.0) | 160 (61.5) | 325 (81.3) |
| AD | 1178 (67.2) | 429 (71.5) | 316 (64.0) | 123 (47.3) | 310 (77.5) |
| VaD | 264 (15.0) | 14 (2.3) | 121 (24.5) | 85 (32.7) | 44 (11.0) |
| OD | 312 (17.8) | 157 (26.2) | 57 (11.5) | 52 (20.0) | 46 (11.5) |
Unless otherwise specified the number reported in table are frequency and the percentage. KP, Kungsholmen Project; HARMONY, Study of Dementia in Swedish Twins; SATSA, Swedish Adoption/Twin Study of Aging; OCTO-Twin; Origins of Variance among Oldest-Old; GENDER, Study of Gender Differences in Health Behaviors and Health among Elderly; SNAC-K, Swedish National study on Aging and Care in Kungsholmen; SD, standard deviation; AD, Alzheimer’s disease; VaD, vascular dementia; OD, other type of dementia. 1Refers to age at first screening; 2Missing data for 287 participants; 3Data excluded.