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 |