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Table 2 Characteristics of the ICUs

From: Association between hospital and ICU structural factors and patient outcomes in China: a secondary analysis of the National Clinical Improvement System Data in 2019

Variables Categories Total Tertiary hospital Secondary hospital X2 p
Number of physicians Median(Q1,Q3) 7(5,11) 10(7,17) 6(4,7)   
Physician-to-bed ratio Median(Q1,Q3) 0.60(0.44,0.78) 0.58(0.44,0.75) 0.60(0.44,0.80)   
   < 0.6 1425(50.53) 730(52.78) 695(48.36) 5.330 0.0210
   ≥ 0.6 1395(49.47) 653(47.22) 742(51.64)   
Number of nurses Median(Q1,Q3) 21(14,36) 34(21,57) 16(11,22)   
Bed-to-nurse ratio Median(Q1,Q3) 0.55(0.44, 0.71) 0.52(0.42, 0.68) 0.58(0.48,0.75)   
   < 0.5 1000(35.46) 590(42.66) 410(28.53) 60.858  < 0.001
   ≥ 0.5 1820(64.54) 793(57.34) 1027(71.47)   
Single room in the ICU Median(Q1,Q3) 2(1,4) 3(2,6) 1(1,2)   
   ≤ 1 1140(40.43) 335(24.22) 805(56.02) 294.537  < 0.001
   > 1 1680(59.57) 1048(75.78) 632(43.98)   
ECMO Median(Q1,Q3) 0(0,0) 0(0,1) 0(0,0)   
  0 2370(84.04) 956(69.13) 1414(98.40) 448.161  < 0.001
   ≥ 1 450(15.96) 427(30.87) 23(1.60)   
Proportion of patient with an APACHEII score ≥ 15 in 24 h after admission (%) Median(Q1,Q3) 58.91(35.12,76.30) 59.28(37.30,76.26) 58.06(33.33,76.58)   
   < 50% 1342(47.59) 619(44.76) 723(50.31) 8.499 0.003
   ≥ 50 1478(52.41) 764(55.24) 714(49.69)   
6 h SSC bundle compliance rate (%) Median(Q1,Q3) 80.00(50.00,100) 82.85(55.94,100) 75.00(42.86,100)   
   < 90% 1936(68.65) 722(52.21) 935(65.07) 47.572  < 0.001
   ≥ 90% 884(31.35) 661(47.79) 502(34.93)   
Microbiology detection rate before antibiotic use(%) Median(Q1,Q3) 91.67(71.47,100) 94.53(78.87,100) 88.14(63.44,100)   
   < 90% 1485(52.66) 622(44.97) 863(60.06) 63.692  < 0.001
   ≥ 90% 1335(47.34) 761(55.03) 574(39.94)