Table 1.

Demographic characteristics of the survey respondents.

		Frequency	%
Sex	Male	2420	80.2
	Female	599	19.8
Age	Younger than 30	657	21.8
	40s	1112	36.8
	50s	852	28.2
	Older than 60	398	13.2
Location	Seoul	866	28.7
	Gyeonggi	500	16.6
	Busan	442	14.6
	Daegu	178	5.9
	Gyeongam	118	3.9
	Incheon	116	3.8
	Gwangju	115	3.8
	Gyeongbuk	114	3.8
	Gangwon	105	3.5
	Chungnam	87	2.9
	Jeonbuk	88	2.9
	Chungbuk	82	2.7
	Daejeon	80	2.6
	Jeonnam	57	1.9
	Ulsan	44	1.5
	Jeju	27	0.9
Occupation	Private doctors	1230	40.7
	Salaried doctors	909	30.1
	Professors	649	21.5
	Other	85	2.8
	Training doctors	83	2.7
	Army surgeons	34	1.1
	Public doctors	29	1.0