Table 1.

Socio-demographic and work-related characteristics of 980 male subway drivers

Characteristics	Classification	N (total = 980)	%
Age, year	20-29	24	2.4
	30-39	193	19.7
	40-49	640	65.3
	≥ 50	123	12.6
Education	High school	178	18.2
	Junior college	308	31.4
	Above college	494	50.4
Marital status	Unmarried	122	12.2
	Married	837	85.4
	Divorced/separated/bereaved	23	2.3
Family income, US dollar/month	< 2,000	5	0.5
	2000-2999	114	11.6
	3000-3999	495	50.5
	4000-4999	221	22.6
	≥ 5000	145	14.8
Years of driving	< 1	40	4.1
	1-4	56	5.7
	5-9	193	19.7
	10-19	575	58.7
	20-29	76	7.8
	≥ 30	40	4.1