Table 1.
Descriptive statistics of the study population from the Swedish Twin Registry and the Health and Retirement Study
| The Swedish Twin Registry | The Health and Retirement Study | |||||
|---|---|---|---|---|---|---|
| All | No dementia | Dementia | All | No dementia | Dementia | |
| N | 22,156 | 18,424 | 3732 | 25,698 | 20,070 | 5628 |
| Female sex, N (%) | 12,351 (55.75) | 10,033 (54.46) | 2318 (62.11) | 14,273 (55.54) | 10,875 (54.19) | 3398 (60.38) |
| Low education, N (%) | 9538 (43.05) | 7319 (39.73) | 2219 (59.46) | 15,713 (61.14) | 11,192 (55.76) | 4521 (80.33) |
| Smokers, N (%) | 12,076 (54.50) | 10,381 (56.34) | 1695 (45.42) | 15,062 (58.61) | 12,020 (59.89) | 3042 (54.05) |
| Age at baseline, mean (SD) | 66.75 (8.59) | 66.40 (8.07) | 68.44 (10.67) | 62.92 (10.83) | 60.69 (9.81) | 70.90 (10.54) |
| Age at last follow-up, mean (SD) | 79.19 (8.96) | 77.83 (8.87) | 85.91 (5.84) | 75.07 (9.30) | 73.82 (8.94) | 79.55 (9.16) |
| Age at death, mean (SD) | 83.88 (7.58) | 82.76 (8.01) | 86.44 (5.74) | 81.43 (9.27) | 79.15 (9.08) | 85.23 (8.28) |
| BMI at baseline, mean (SD) | 25.48 (3.77) | 25.57 (3.83) | 25.03 (3.48) | 27.18 (5.18) | 27.34 (5.22) | 26.60 (5.01) |
Descriptive statistics for all individuals, individuals without dementia, and individuals with dementia in the Swedish Twin Registry and the Health and Retirement Study. Statistics are presented as number (%) of individuals for categorical variables and mean level (SD) for continuous variables
N number, SD standard deviation, BMI body mass index