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Table 1 Hospital characteristics before and after propensity score matching

From: Hospital quality reporting and improvement in quality of care for patients with acute myocardial infarction

Hospital characteristic

All hospitals

Matched hospitals

Reporting, n (%)

(N = 146)

Non-reporting, n (%)

(N = 327)

Standardized difference

Reporting, n (%)

(N = 135)

Non-reporting, n (%)

(N = 135)

Standardized difference

Geographical region

 Hokkaido and Tohoku

12 (8.2)

55 (16.8)

−26.2

12 (8.9)

15 (11.1)

−7.4

 Kanto

31 (21.2)

87 (26.6)

−12.6

31 (23.0)

28 (20.7)

5.4

 Chubu

26 (17.8)

55 (16.8)

2.6

24 (17.8)

23 (17.0)

2.0

 Kansai

37 (25.3)

50 (15.3)

25.2

31 (23.0)

31 (23.0)

0.0

 Chugoku and Shikoku

14 (9.6)

22 (6.7)

10.5

12 (8.9)

11 (8.1)

2.7

 Kyushu

26 (17.8)

58 (17.7)

0.2

25 (18.5)

27 (20.0)

−3.8

DPC category 2 hospital

25 (17.1)

42 (12.8)

12.0

20 (14.8)

21 (15.6)

−2.1

Number of acute-care beds

  < 300

31 (21.2)

89 (27.2)

−14.0

31 (23.0)

36 (26.7)

−8.6

 300–399

37 (25.3)

92 (28.1)

−6.3

34 (25.2)

33 (24.4)

1.7

 400–499

27 (18.5)

58 (17.7)

2.0

27 (20.0)

24 (17.8)

5.7

  ≥ 500

51 (34.9)

88 (26.9)

17.4

43 (31.9)

42 (31.1)

1.6

Annual number of hospital ambulance acceptances

  < 2000

30 (20.5)

96 (29.4)

−20.5

30 (22.2)

33 (24.4)

−5.3

 2000–2999

34 (23.3)

82 (25.1)

−4.2

32 (23.7)

34 (25.2)

−3.4

 3000–3999

25 (17.1)

50 (15.3)

5.0

22 (16.3)

22 (16.3)

0.0

  ≥ 4000

57 (39.0)

99 (30.3)

18.5

51 (37.8)

46 (34.1)

7.7

Three or more angiography systems

37 (25.3)

74 (22.6)

6.4

35 (25.9)

28 (20.7)

12.3

Annual number of regional ambulance acceptances

  < 10,000

20 (13.7)

86 (26.3)

−31.9

19 (14.1)

20 (14.8)

−2.1

 10,000–29,999

57 (39.0)

105 (32.1)

14.5

54 (40.0)

55 (40.7)

−1.5

 30,000–49,999

30 (20.5)

47 (14.4)

16.3

26 (19.3)

24 (17.8)

3.8

  ≥ 50,000

39 (26.7)

89 (27.2)

−1.1

36 (26.7)

36 (26.7)

0.0

ICU admission of AMI patients

73 (50.0)

121 (37.0)

26.4

65 (48.1)

64 (47.4)

1.5

Emergency center admission of AMI patients

31 (21.2)

44 (13.5)

20.6

21 (15.6)

28 (20.7)

−13.5

CABG surgery for AMI patients

58 (39.7)

96 (29.4)

21.9

49 (36.3)

44 (32.6)

7.8

Hospital volume of AMI patients

  < 20

29 (19.9)

75 (22.9)

−7.5

29 (21.5)

31 (23.0)

−3.6

 20–34

34 (23.3)

83 (25.4)

−4.9

32 (23.7)

28 (20.7)

7.1

 35–49

32 (21.9)

73 (22.3)

−1.0

29 (21.5)

30 (22.2)

− 1.8

  ≥ 50

51 (34.9)

96 (29.4)

12.0

45 (33.3)

46 (34.1)

−1.6

Risk-adjusted mortality

0.127 ± 0.068

0.127 ± 0.073

0.1

0.124 ± 0.066

0.129 ± 0.078

−7.8

  1. Abbreviations: AMI Acute myocardial infarction, CABG Coronary artery bypass graft, DPC Diagnosis Procedure Combination, ICU intensive care unit