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Table 1 General characteristics of the total study population

From: Comparing Charlson and Elixhauser comorbidity indices with different weightings to predict in-hospital mortality: an analysis of national inpatient data

Parameters Alive cohort (%) Mortality cohort (%) SMD
aTotal population: N = 6,094,672 5,952,005 (97.7) 142,667 (2.3)  
Females 3,280,823 (55.1) 63,912 (44.8) 0.208
Age groups 1.006
 20–24 years 215,672 (3.6) 292 (0.2)  
 25–29 years 327,562 (5.5) 375 (0.3)  
 30–34 years 415,022 (7.0) 526 (0.4)  
 35–39 years 348,591 (5.9) 718 (0.5)  
 40–44 years 299,985 (5.0) 1368 (1.0)  
 45–49 years 350,899 (5.9) 2503 (1.8)  
 50–54 years 408,028 (6.9) 4312 (3.0)  
 55–59 years 430,721 (7.2) 6503 (4.6)  
 60–64 years 466,543 (7.8) 9068 (6.4)  
 65–69 years 528,374 (8.9) 13,322 (9.3)  
 70–74 years 554,612 (9.3) 16,899 (11.8)  
 75–79 years 535,543 (9.0) 19,888 (13.9)  
 80–84 years 509,225 (8.6) 24,853 (17.4)  
 85–89 years 365,924 (6.1) 24,042 (16.9)  
 90–94 years 161,236 (2.7) 14,156 (9.9)  
 95+ years 34,068 (0.6) 3842 (2.7)  
Hospital types 0.157
 University (level 1) 1,078,612 (18.1) 29,379 (20.6)  
 Tertiary care (level 2) 3,274,382 (55.0) 83,686 (58.7)  
 Basic care (level 3) 736,465 (12.4) 14,863 (10.4)  
 Basic care (level 4) 671,182 (11.3) 10,695 (7.5)  
 Basic care (level 5) 191,364 (3.2) 4044 (2.8)  
Number of Charlson comorbidities 1.234
 0 3,642,650 (61.2) 17,465 (12.2)  
 1–2 1,907,761 (32.1) 80,876 (56.7)  
  > = 3 401,594 (6.7) 44,326 (31.1)  
Number of Elixhauser comorbidities 1.039
 0 2,509,169 (42.2) 11,036 (7.7)  
 1–2 2,106,780 (35.4) 43,494 (30.5)  
  > = 3 1,336,056 (22.4) 88,137 (61.8)  
  1. Abbreviations: SMD standardized mean difference between alive and mortality cohort
  2. aTotal population presented in row percentage