Table 2.
Participant characteristics.
| Overall | Male | Female | |
|---|---|---|---|
| Number of participants, n (%) | 141 | 78 (55) | 63 (45) |
| Age (years), mean (SD) | 75.0 (5.9) | 76.2 (5.6) | 73.5 (6.0) |
| Education (years), mean (SD) | 13.0 (2.2) | 13.2 (2.5) | 12.7 (1.7) |
| Driving frequency, n (%) | |||
| Less than once per month | 0 (0) | 0 (0) | 0 (0) |
| Once every 2–3 weeks | 4 (3) | 3 (2) | 1 (1) |
| Once a week | 13 (9) | 7 (5) | 6 (4) |
| Once every 2–3 days | 44 (31) | 23 (16) | 21 (15) |
| Every day | 80 (57) | 45 (32) | 35 (25) |
| Driving distance per week, n (%) | |||
| 0 km | 0 (0) | 0 (0) | 0 (0) |
| 1–10 km | 32 (23) | 13 (9) | 19 (13) |
| 11–50 km | 59 (42) | 27 (19) | 32 (23) |
| 51–100 km | 35 (25) | 25 (18) | 10 (7) |
| 101–300 km | 12 (9) | 11 (8) | 1 (1) |
| 301 km ≤ | 3 (2) | 2 (1) | 1 (1) |
| MMSE-J score, mean (SD) | 28.4 (1.6) | 28.2 (1.6) | 28.7 (1.5) |
| dCDT score, mean (SD) | 7.1 (2.1) | 6.8 (2.1) | 7.3 (2.0) |
MMSE-J, Mini-Mental State Examination-Japanese; dCDT, digital Clock Drawing Test; SD, standard deviation.