Table 1

Descriptive statistics of the analysed sample stratified by incident dementia

CharacteristicDid not develop dementia (N=1 94 361)Developed dementia (N=1762)
Age, years, mean (SD)64.1 (2.9)65.8 (2.7)
Sex, N (%)
 Men91 864 (47)974 (55)
 Women102 497 (53)788 (45)
Education level, N (%)*
 Higher4291 (2)31 (2)
 Upper secondary103 277 (53)1014 (58)
 Lower secondary17 605 (9)141 (8)
 Vocational41 357 (21)336 (19)
 Other27 831 (14)240 (14)
Socioeconomic status*
 Least deprived38 894 (20)318 (18)
 Intermediate deprivation116 741 (60)945 (54)
 Most deprived38 726 (20)499 (28)
Third-degree relatedness, N (%)
 Not related131 607 (68)1167 (66)
 Related62 754 (32)595 (34)
Frailty index
 Score, mean (SD)0.13 (0.07)0.17 (0.09)
 Group, N (%)
 Low frailty score127 267 (66)883 (50)
 Intermediate frailty score61 220 (32)711 (40)
 High frailty score5874 (3)168 (10)
Polygenic risk
Z score, mean (SD)0.00 (1.00)0.22 (1.02)
 Group, N (%)
 Low genetic risk38 979 (20)245 (14)
 Intermediate genetic risk116 638 (60)1036 (59)
 High genetic risk38 744 (20)481 (27)
Healthy lifestyle*
 Score, mean (SD)2.75 (0.94)2.63 (0.99)
 Group, N (%)
 0 healthy behaviours2062 (1)29 (2)
 1 healthy behaviour16 737 (9)204 (12)
 2 healthy behaviours53 603 (28)523 (30)
 3 healthy behaviours76 702 (40)645 (37)
 4 healthy behaviours45 257 (23)361 (21)
  • *Data presented here include imputed values for those that were missing: there were 2514 missing values for education level and 165 missing values for socioeconomic status; we also imputed the missing values of individual components of the healthy lifestyle score prior to its calculation. Proportions may not sum to 100 due to rounding.