Table 2 Demographic characteristics of 1,227 Japanese male taxi drivers based on the presence of the CLOCK CHART detected defects.

N

1,032

195

Mean age (SD), years

50.7 (11.2)

56.9 (10.3)

 < 0.01^a

Mean BMI (SD), kg/m²

24.5 (3.9)

24.6 (4.0)

0.66^a

Current drinker, n, (%)

765 (74.1%)

128 (65.6%)

 < 0.05^b

Current smoker, n, (%)

433 (42.0%)

84 (43.1%)

0.77^b

Excessive daytime sleepiness

60 (5.8%)

9 (4.6%)

0.50^b

Hypertension, n, (%)

210 (20.3%)

69 (35.4%)

 < 0.01^b

Diabetes mellitus, n, (%)

81 (7.8%)

24 (12.3%)

0.04^b

Motor vehicle accidents, n, (%)

644 (62.4%)

115 (59.0%)

 < 0.01^b

VF-related near miss, n, (%)

387 (37.5%)

89 (45.6%)

0.03^b

Median driving experience (IQR), years

7

10 (5–18)

 < 0.01^c

Median driving distance (IQR), km/year

36,000 (25,650–40,320)

36,000 (24,000–40,000)

0.21^c

Mean daily working hours (SD), hours

14.7

14.1 (5.7)

0.14^a