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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
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