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Table 4 Risk adjusted odds ratios, incident rate ratios, beta-coefficients and suggested weights

From: Australian Injury Comorbidity Indices (AICIs) to predict burden and readmission among hospital-admitted injury patients

  Australian Injury Comorbidity Indices Existing comorbidity indices
Overnight stay LOS CCI Updated CCI per Quan et al. (2011) ECM point scores per van Walraven et al. (2009)
OR (95% CI) Injury comorbidity index weight IRR (95% CI) Injury comorbidity index weight
15–24 years 0.43 (0.41–0.45)   0.41 (0.40–0.42)     
25–44 years 0.48 (0.46–0.50)   0.45 (0.45–0.46)     
45–64 years 0.63 (0.60–0.66)   0.57 (0.56–0.58)     
65–84 years Reference group   Reference group     
85+ years 1.16 (1.09–1.22)   1.26 (1.24–1.29)     
Female sex 1.11 (1.08–1.14)   1.12 (1.11–1.13)     
Serious injury 4.92 (4.56–5.32)   1.83 (1.80–1.86)     
HIV/AIDS 6 4 0
Alcohol dependence 1.38 (1.29–1.48) 1 1.17 (1.14–1.20)* # # 0
Drug dependence 2.34 (2.01–2.72) 2 1.56 (1.49–1.64) 2 # # -7
Any malignancy 7.39 (4.52–12.08) 7 1.56 (1.40–1.73) 2 2 2 4
Blood loss anemia 5.98 (1.84–19.37) 6 1.40 (1.20–1.63) 1 # # −2
Cardiac arrhythmias 2.45 (2.15–2.80) 2 1.32 (1.28–1.36) 1 # # 5
Cerebrovascular disease 1.18 (1.08–1.29)* 1 0 ##
Chronic pulmonary disease 6.29 (4.26–9.30) 6 1.46 (1.38–1.54) 1 1 1 3
Coagulopathy 3.74 (2.80–4.99) 4 1.43 (1.35–1.51) 1 # # 3
Congestive heart failure 7.06 (4.27–11.67) 7 1.27 (1.20–1.34) 1 1 2 7
Deficiency anemias 8.70 (4.73–16.00) 9 1.62 (1.50–1.76) 2 # # −2
Dementia 2.00 (1.70–2.34) 2 1 2 ##
Depression 3.25 (2.89–3.65) 3 1.93 (1.86–2.01) 2 # # −3
Diabetes with chronic complications 1.42 (1.26–1.60) 1 1.27 (1.23–1.31) 1 2 1 0
Diabetes without complications 1.20 (1.13–1.28) 1 1.12 (1.09–1.14) 1 0 0
Hemiplegia/paraplegia 5.03 (3.12–8.10) 5 1.62 (1.47–1.78) 2 2 2 7
Hypertension complicated # # 0
Hypertension uncomplicated 2.49 (2.15–2.88) 2 1.25 (1.21–1.29) 1 # # 0
Hypothyroidism 21.25 (2.92–154.54) 21 1.72 (1.49–2.00) 2 # # 0
Metastatic solid tumor 1.32 (1.15–1.51) 1 6 6 12
Mild liver disease 1.63 (1.38–1.93) 2 1.27 (1.20–1.34) 1 1 2 11
Moderate or severe liver disease 20.78 (2.85–151.33) 21 1.83 (1.53–2.19) 2 3 4 11
Myocardial infarction 1 0 ##
Obesity 4.41 (2.27–8.56) 4 2.10 (1.85–2.39) 2 # # −4
Peptic ulcer disease 1.55 (1.25–1.91) 2 1 0 0
Peripheral vascular disease 3.11 (2.35–4.13) 3 1.88 (1.76–2.02) 2 1 0 2
Psychoses 5.54 (3.96–7.74) 6 3.14 (2.91–3.40) 3 # # 0
Pulmonary circulation disorders 1.81 (1.52–2.15) 2 # # 4
Renal disease including renal failure 1.58 (1.32–1.89) 2 1.17 (1.12–1.21)* 2 1 5
Rheumatic disease including some other connective tissue disorders 33.10 (4.59–238.47) 33 1.93 (1.67–2.24) 2 1 1 0
Valvular disease 5.28 (2.30–12.13) 5 1.36 (1.22–1.52) 1 # # −1
  Australian Injury Comorbidity Indices Existing comorbidity indices
Hospital cost All-cause 30-day readmission Non-planned 30-day readmission CCI Updated CCI per Quan et al. (2011) ECM point scores per van Walraven et al. (2009)
Beta coefficient (95% CI) Injury comorbidity index weight1 OR (95% CI) Injury comorbidity index weight OR (95% CI) Injury comorbidity index weight
15–24 years −0.25 (−0.28--0.23)   0.47 (0.44–0.50)   0.51 (0.47–0.55)     
25–44 years − 0.21 (− 0.23--0.19)   0.58 (0.55–0.61)   0.64 (0.60–0.68)     
45–64 years −0.16 (− 0.18--0.14)   0.70 (0.67–0.74)   0.69 (0.65–0.73)     
65–84 years Reference group   Reference group   Reference group     
85+ years 0.02 (0.00–0.04)   1.01 (0.96–1.06)   1.18 (1.12–1.26)     
Female sex −0.03 (−0.04--0.01)   0.97 (0.94–1.01)   0.95 (0.91–0.99)     
serious injury 0.89 (0.86–0.91)    1.07 (1.00–1.14)     
HIV/AIDS 6 4 0
Alcohol dependence 0.20 (0.17–0.23) 1 1.23 (1.14–1.33) 1 1.35 (1.24–1.47) 1 # # 0
Drug dependence 0.47 (0.41–0.52) 2 1.46 (1.23–1.72) 1 # # −7
Any malignancy 0.74 (0.65–0.83) 2 4.10 (3.45–4.86) 4 2 2 4
Blood loss anemia 0.61 (0.45–0.78) 2 # # −2
Cardiac arrhythmias 0.48 (0.44–0.52) 2 # # 5
Cerebrovascular disease 1 0 ##
Chronic pulmonary disease 0.57 (0.51–0.64) 2 1.45 (1.26–1.67) 1 1.63 (1.40–1.90) 2 1 1 3
Coagulopathy 0.49 (0.43–0.56) 2 1.48 (1.27–1.72) 1 1.60 (1.36–1.88) 2 # # 3
Congestive heart failure 0.38 (0.31–0.45) 1 1.40 (1.19–1.65) 1 1 2 7
Deficiency anemias 0.66 (0.56–0.75) 2 # # −2
Dementia 0.16 (0.11–0.20)* 1 2 ##
Depression 0.63 (0.59–0.67) 2 1.38 (1.24–1.53) 1 # # −3
Diabetes with chronic complications 0.26 (0.22–0.30) 1 1.26 (1.15–1.38) 1 1.33 (1.20–1.47) 1 2 1 0
Diabetes without complications 0.10 (0.07–0.12)* 1.18 (1.11–1.26)* 1.22 (1.14–1.31) 1 1 0 0
Hemiplegia/paraplegia 0.70 (0.60–0.79) 2 2 2 7
Hypertension complicated 0.48 (0.20–0.76) 2 # # 0
Hypertension uncomplicated 0.42 (0.38–0.46) 2 # # 0
Hypothyroidism 0.56 (0.39–0.74) 2 # # 0
Metastatic solid tumor 2.42 (1.83–3.21) 2 6 6 12
Mild liver disease 0.32 (0.25–0.38) 1 1.74 (1.50–2.03) 2 1.89 (1.60–2.24) 2 1 2 11
Moderate or severe liver disease 0.81 (0.60–1.01) 2 3 4 11
Myocardial infarction 0.24 (0.10–0.38) 1 1 0 ##
Obesity 0.80 (0.65–0.95) 2 # # −4
Peptic ulcer disease 0.65 (0.40–0.91) 2 1 0 0
Peripheral vascular disease 0.75 (0.66–0.83) 2 1 0 2
Psychoses 1.04 (0.95–1.13) 3 1.69 (1.36–2.08) 2 1.57 (1.23–2.00) 2 # # 0
Pulmonary circulation disorders 0.79 (0.58–0.99) 2 # # 4
Renal disease including renal failure 0.19 (0.14–0.24) 1 2.02 (1.83–2.21) 2 1.67 (1.50–1.86) 2 2 1 5
Rheumatic disease including some other connective tissue disorders 0.83 (0.66–1.01) 2 1 1 0
Valvular disease 0.41 (0.28–0.55) 2 # # −1
  1. Note:
  2. - Condition not significantly associated with outcome
  3. # Not included in CCI list
  4. ## Not included in ECM list
  5. *Excluded from weighted index as OR < 1.2
  6. 1. Weight = exp. (beta)
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