Skip to main content

Table 4 Hospital characteristics associated with year-specific risk-standardized length of stay

From: National trends in hospital length of stay for acute myocardial infarction in China

Hospital characteristics N (%) Difference in risk-standardized length of stay and 95%confidence intervals (in days) P-value
  2001 2006 2011   
  (n = 130) (n = 152) (n = 158)   
Geographic region      
 Eastern 55 (42.3) 60 (39.5) 63 (39.9) 0 (ref)  
 Central 41 (31.5) 48 (31.6) 48 (30.4) −1.6 (−2.9, −0.2) 0.02
 Western 34 (26.2) 44 (29.0) 47 (29.8) 0.3 (−1.1, 1.6) 0.7
Tertiary (vs. secondary) 56 (43.1) 64 (42.1) 65 (41.1) 0.5 (−0.7, 1.7) 0.4
Affiliated/teaching status      
 Neither affiliated nor teaching 37 (28.5) 42 (27.6) 42 (26.6) 0 (ref)  
 Teaching but not affiliated 48 (36.9) 53 (34.9) 54 (34.2) 0.2 (−1.0, 1.3) 0.8
 Both teaching and affiliated 45 (34.6) 57 (37.5) 62 (39.2) −0.4 (−2.1, 1.2) 0.6
Annual AMI patients volume      
 ≤10 58 (44.6) 39 (25.7) 17 (10.8) 0 (ref)  
 11-30 37 (28.5) 43 (28.3) 29 (18.4) 0.1 (−0.9, 1.2) 0.8
 31-80 25 (19.2) 35 (23.0) 52 (32.9) 0.6 (−0.7, 1.8) 0.4
 >80 10 (7.7) 35 (23.0) 60 (38.0) 0.8 (−0.6, 2.2) 0.3
Cardiac catheterization (vs. not) 33 (25.4) 58 (38.2) 74 (46.8) 0 (−0.5, 0.5) 0.9
Independent cardiology department (vs. not) 28 (21.5) 58 (38.2) 78 (49.4) −0.3 (−0.7, 0.2) 0.2
Capacity to test biomarkers      
 None 24 (18.5) 11 (7.2) 2 (1.3) 0 (ref)  
 CK only 29 (22.3) 9 (5.9) 2 (1.3) 0.1 (−1.1, 1.3) 0.9
 CK-MB 44 (33.9) 44 (29.0) 27 (17.1) 0.2 (−0.8, 1.2) 0.7
 Troponin 33 (25.4) 88 (57.9) 127 (80.4) 0.4 (−0.6, 1.5) 0.4
  1. CK: creatine kinase; CK-MB: creatine kinase MB fraction.