Table 1 Demographic characteristics of participants

 number

605

563

645

551

2412

3354

Gender (%)

 Male

88.1

82.6

81.4

2.2

0.7

1.1

 Female

11.9

17.4

18.6

97.8

99.3

98.9

Age (y) (%)

 20–30

12.3

19.8

12.4

42.1

42.0

49.4

 31–40

43.8

41.8

50.2

42.8

44.1

41.5

 41–50

33.6

25.4

25.0

13.5

12.5

8.3

  > 50

10.3

13.0

12.4

1.6

1.4

0.8

Working period (y) (%)

 < 5

25.8

31.2

25.2

19.9

18.2

31.5

 5–10

25.6

29.6

35.7

36.4

43.3

39.8

  > 10

48.6

39.2

39.1

43.8

38.5

28.7

Academic level (%)

 Technical school

0

0

0

40.5

53.1

43.5

 Junior college

0

0

0

31.8

26.2

33.0

 Bachelor’s*

80.6

80.2

78.3

24.3

18.0

21.2

 Master’s

15.5

15.6

16.0

3.4

2.6

2.2

 Doctorate

3.9

4.2

5.7

0

0.1

0.1

EBM training (%)

55.2

50.4

39.5

22.7

14.3

15.6

Director (%)

34.3

24.8

25.4

22.1

11.8

8.9

Faculty (%)

33.9

38.8

39.9

23.4

14.7

14.5