Table 1.

Characteristics of firefighters.

Characteristics	Category	N	%
Number of Participants	Total	5196
Sex	Male	4803	92.44
	Female	393	7.56
Age (Mean ± SD)		38.14 ± 8.68
Job position 1	Low	2594	56.85
	Middle	2207	42.48
	High	35	0.67
Education	High school	997	19.20
	College	1733	33.37
	University	2277	43.85
	Graduate school	72	1.39
Drinking	Yes	3823	73.62
	No	1370	26.38
Smoking	Yes	1462	28.15
	No	3731	71.85
Shift-type	3 circuit	517	9.95
	21 circuit	4679	90.05
City size	Large city	2038	42.49
	Small town	2758	57.51
Exercise training	≥150	2324	46.37
(min/week)	<150	2688	53.63

¹ Low job position includes firefighter, senior fireman; Middle job position includes fire sergeant, fire lieutenant, fire captain; High job position includes assistant fire chief, fire chief, above fire sub-deputy chief.