Table 1.
Descriptive characteristics of the study population (N = 1,002)
| Variables | |
| Age, y, mean (SD) | 65.0 (7.1) |
| Sex, women, n (%) | 514 (51.3) |
| Education, n (%) | |
| Primary | 55 (5.5) |
| Lower | 350 (34.9) |
| Intermediate | 309 (30.8) |
| Higher | 288 (28.7) |
| Employment, n (%) | |
| Paid employment | 329 (33.5) |
| Retired | 513 (52.3) |
| No paid employment | 139 (14.2) |
| Body mass index, kg/m2, mean (SD) | 27.4 (4.1) |
| Smoking status, n (%) | |
| Current | 107 (10.7) |
| Former | 582 (58.0) |
| Never | 313 (31.2) |
| Alcohol consumption, g/day, mean (SD) | 7.9 (8.4) |
| Coffee consumption during actigraphy, days, mean (SD) | 4.4 (2.9) |
| Sleep medication during actigraphy, n (%) | 120 (12.0) |
| Possible sleep apnea, n (%) | 97 (9.6) |
| Diabetes mellitus, n (%) | 132 (13.2) |
| Hypertension, n (%) | 648 (64.7) |
| Depressive symptoms, CES-D score, mean (SD) | 5.3 (6.8) |
SD, standard deviation; CES-D, Center for Epidemiological Studies Depression Scale. Missing: Employment n = 21; Body mass index n = 1; Alcohol consumption n = 1; Coffee consumption n = 4; Sleep medication n = 6; Diabetes mellitus n = 2; Depressive symptoms n = 2.