Table 1.
Characteristics of the development datasets from the National Health Insurance Service-Health Screening Cohort (40-79 years of age).
| Variable | All-cause dementia (n=43,648) | Alzheimer dementia (n=20,026) | ||
| Baseline | Repeated measurement | Baseline | Repeated measurement | |
| Duration of follow-up (years), mean (SD) | 9.11 (2.27) | —a | 9.20 (2.21) | — |
| Number of periodic health examinations (n), mean (SD) | 4.72 (2.34) | — | 4.76 (2.33) | — |
| Age (years), mean (SD) | 57.97 (10.61) | — | 58.34 (10.70) | — |
| Sex (female), n (%) | 22,374 (51.26) | — | 10,465 (52.26) | — |
| Body mass index (kg/m2), mean (SD) | 23.98 (3.06) | 23.90 (2.89) | 23.95 (3.09) | 23.86 (2.92) |
| Systolic blood pressure (mm Hg), mean (SD) | 129.45 (18.85) | 128.64 (13.34) | 129.17 (18.74) | 128.45 (13.20) |
| Diastolic blood pressure (mm Hg), mean (SD) | 80.16 (11.81) | 79.04 (7.85) | 79.85 (11.76) | 78.83 (7.75) |
| Fasting plasma glucose (mg/dL), mean (SD) | 100.56 (38.08) | 102.17 (26.46) | 100.54 (38.82) | 102.03 (25.96) |
| Total cholesterol (mg/dL), mean (SD) | 201.79 (39.14) | 199.82 (30.70) | 201.64 (38.67) | 199.64 (30.75) |
| Smoking, n (%) | 9192 (21.06) | 8302 (19.02) | 4088 (20.41) | 3667 (18.31) |
| No exercise, n (%) | 16,492 (37.78) | 24,530 (56.20) | 7522 (37.56) | 11,233 (56.09) |
| Cardiovascular disease, n (%) | 5061 (11.60) | 23,463 (53.76) | 2273 (11.35) | 10,516 (52.51) |
| Diabetes, n (%) | 2708 (6.20) | 7092 (16.25) | 1271 (6.35) | 3317 (16.56) |
| Hypertension, n (%) | 5447 (12.48) | 17,517 (40.13) | 2442 (12.19) | 7919 (39.54) |
| Psychiatric disorder, n (%) | 2308 (5.29) | 17,088 (39.15) | 1064 (5.31) | 7941 (39.65) |
| Neurological disorder, n (%) | 5920 (13.56) | 28,105 (64.39) | 2720 (13.58) | 12,854 (64.19) |
aNot applicable.