Table 1. Demographic characteristics of the participants (Iran, 2015) .

Variable	Level	n ( %)
Sex	Male	11835 (85.5)
	Female	2007 (14.5)
Education	Primary school or lower	734 (5.3)
	Middle school/ high school	7142 (51.6)
College or university degree	5966 (43.1)
Marital status	Single	2338 (16.9)
	Married	11323 (81.8)
Divorced or widow	181 (1.3)
Worker’s class	Skilled worker*	8264 (59.7)
	Unskilled worker	4388 (31.7)
Other**	1190 (8.6)

* Any worker who has attended a vocational training program at a high school, college, university, or technical school.

** Applies to jobs with no available institutional training program.