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Table 1 Characteristics of the Victorian, NSW and WA study populations

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

  Patients admitteda between July 2012 and June 2014, n (%)
Victoria NSW WA
n % At least one comorbidity (%) Count of comorbidities, mean (95% CI) n % At least one comorbidity (%) Count of comorbidities, mean (95% CI) n % At least one comorbidity (%) Count of comorbidities, mean (95% CI)
Total patients 161,334 233,521 84,877
Age group (years)
 0–14 years 21,240 13.2 1.4 0.01 (0.01–0.02) 31,730 13.6 1.5 0.02 (0.01–0.02) 13,106 15.4 1.9 0.02 (0.02–0.02)
 15–24 years 23,213 14.4 9.9 0.12 (0.11–0.12) 33,888 14.5 11.0 0.13 (0.13–0.14) 13,676 16.1 15.3 0.18 (0.17–0.19)
 25–44 years 36,262 22.5 13.0 0.16 (0.16–0.17) 51,737 22.2 13.5 0.17 (0.17–0.18) 22,617 26.6 18.6 0.23 (0.22–0.23)
 45–64 years 30,799 19.1 19.3 0.25 (0.25–0.26) 44,501 19.1 18.3 0.25 (0.24–0.26) 16,344 19.3 21.6 0.29 (0.28–0.30)
 65–84 years 31,390 19.5 35.9 0.54 (0.53–0.54) 44,948 19.2 33.2 0.51 (0.50–0.52) 12,598 14.8 36.0 0.55 (0.54–0.57)
 85 and over 18,430 11.4 40.0 0.62 (0.60–0.63) 26,717 11.4 38.2 0.60 (0.59–0.62) 6536 7.7 41.5 0.64 (0.62–0.66)
Sex
 Maleb 89,144 55.3 16.8 0.24 (0.23–0.24) 131,598 56.4 16.2 0.23 (0.23–0.24) 49,994 58.9 18.0 0.24 (0.24–0.25)
 Female 72,190 44.7 23.5 0.33 (0.33–0.34) 101,923 43.6 22.7 0.33 (0.32–0.33) 34,883 41.1 24.0 0.33 (0.32–0.34)
Injury severityc
 Serious injury (ICISS< 0.941) 20,884 12.9 40.6 0.64 (0.63–0.65) 30,265 13.0 35.5 0.57 (0.56–0.59) 9566 11.3 38.3 0.60 (0.58–0.62)
 Other injury (ICISS> = 0.941) 140,450 87.1 16.7 0.22 (0.22–0.23) 203,256 87.0 16.6 0.23 (0.23–0.23) 75,311 88.7 18.2 0.24 (0.23–0.24)
Grouped body region
 Head/face/neck 32,052 19.9 19.2 0.26 (0.25–0.27) 48,159 20.6 20.7 0.29 (0.28–0.29) 18,350 21.6 23.7 0.31 (0.30–0.32)
 Trunk 20,730 12.8 25.0 0.36 (0.35–0.37) 29,199 12.5 23.1 0.34 (0.33–0.35) 9835 11.6 23.5 0.34 (0.33–0.35)
 Upper extremity 54,549 33.8 9.8 0.12 (0.12–0.13) 77,389 33.1 9.4 0.12 (0.12–0.13) 27,833 32.8 10.9 0.14 (0.13–0.14)
 Lower extremity 41,528 25.7 22.8 0.34 (0.33–0.35) 57,954 24.8 19.6 0.30 (0.30–0.31) 20,678 24.4 20.9 0.31 (0.30–0.32)
 Multiple body regions 53 0.0 18.9 0.25 (0.09–0.40) 170 0.1 18.8 0.26 (0.17–0.35) 51 0.1 25.5 0.31 (0.15–0.47)
 Unspecified body region 585 0.4 22.6 0.31 (0.26–0.37) 1247 0.5 22.3 0.34 (0.30–0.38) 376 0.4 22.1 0.30 (0.23–0.36)
 Body region not relevant 11,837 7.3 47.7 0.66 (0.65–0.68) 19,403 8.3 45.5 0.65 (0.64–0.66) 7754 9.1 41.6 0.56 (0.55–0.58)
Grouped injury type (First occurring)
 Superficial injury 8055 5.0 23.8 0.34 (0.32–0.35) 14,875 6.4 22.6 0.33 (0.32–0.34) 4659 5.5 27.7 0.37 (0.35–0.39)
 Open wound 22,398 13.9 14.8 0.19 (0.18–0.20) 35,691 15.3 16.9 0.23 (0.22–0.23) 12,623 14.9 20.6 0.27 (0.26–0.28)
 Fracture 66,686 41.3 19.6 0.29 (0.28–0.29) 94,258 40.4 17.3 0.26 (0.26–0.27) 30,714 36.2 18.5 0.27 (0.26–0.27)
 Dislocation, sprain & strain 10,989 6.8 8.2 0.10 (0.10–0.11) 13,330 5.7 6.6 0.09 (0.08–0.09) 6755 8.0 7.5 0.09 (0.08–0.10)
 Injury to nerves & spinal cord 2038 1.3 10.4 0.13 (0.11–0.14) 2559 1.1 8.6 0.11 (0.10–0.13) 1147 1.4 11.1 0.14 (0.11–0.16)
 Injury to blood vessels 1347 0.8 11.5 0.15 (0.12–0.17) 1096 0.5 15.0 0.19 (0.16–0.22) 650 0.8 18.5 0.23 (0.19–0.28)
 Injury to muscle & tendon 8451 5.2 9.1 0.11 (0.10–0.12) 10,921 4.7 6.7 0.08 (0.08–0.09) 5423 6.4 10.1 0.12 (0.11–0.13)
 Crushing injury 335 0.2 3.3 0.04 (0.01–0.06) 469 0.2 3.4 0.04 (0.02–0.06) 166 0.2 4.2 0.05 (0.01–0.08)
 Traumatic amputation 1612 1.0 7.3 0.08 (0.07–0.10) 1622 0.7 6.8 0.08 (0.06–0.10) 747 0.9 7.9 0.09 (0.07–0.11)
 Eye injury- excluding foreign body 512 0.3 16.4 0.22 (0.17–0.27) 919 0.4 17.3 0.22 (0.19–0.26) 308 0.4 19.5 0.23 (0.17–0.28)
 Intracranial injury 6416 4.0 29.4 0.43 (0.41–0.45) 9355 4.0 28.1 0.42 (0.41–0.44) 3385 4.0 30.6 0.44 (0.41–0.47)
 Injury to internal organs 1762 1.1 23.5 0.32 (0.29–0.35) 2198 0.9 22.5 0.32 (0.29–0.35) 1066 1.3 23.7 0.34 (0.29–0.38)
 Foreign body 2733 1.7 11.3 0.15 (0.13–0.16) 3947 1.7 9.2 0.12 (0.10–0.13) 1486 1.8 9.6 0.12 (0.10–0.14)
 Burns 1879 1.2 15.1 0.21 (0.18–0.23) 3244 1.4 8.8 0.12 (0.10–0.14) 1660 2.0 14.3 0.20 (0.17–0.22)
 Other and unspecified injury 14,284 8.9 19.8 0.27 (0.26–0.28) 19,634 8.4 19.6 0.28 (0.27–0.29) 6334 7.5 22.8 0.30 (0.29–0.32)
 Systemic-poisoning/toxic effects 10,536 6.5 49.5 0.68 (0.67–0.70) 17,162 7.3 47.8 0.67 (0.66–0.68) 6866 8.1 43.5 0.59 (0.57–0.60)
 Other effects of external cause/complication 1301 0.8 32.5 0.54 (0.48–0.59) 2241 1.0 28.2 0.47 (0.43–0.50) 888 1.0 26.7 0.40 (0.35–0.45)
Geographic region
 Metropolitan Area 118,959 73.7 19.8 0.28 (0.27–0.28) 158,595 67.9 18.9 0.28 (0.27–0.28) 60,151 70.9 19.7 0.27 (0.27–0.28)
 Regional Area 42,375 26.3 19.8 0.28 (0.27–0.29) 74,918 32.1 19.2 0.27 (0.26–0.27) 24,405 28.8 22.1 0.29 (0.28–0.30)
 Unknown      8 0.0 * 0.25 (−0.07–0.57) 321 0.4 34.6 0.42 (0.35–0.50)
 All-cause readmissionsd 17,946 11.4 18.0 0.46 (0.45–0.47) 30,922 13.7 25.1 0.38 (0.37–0.39) 9930 12.1 30.6 0.45 (0.43–0.47)
 Non-planned readmissionsd 11,954 7.6 12.7 0.50 (0.48–0.51) 17,362 7.7 30.8 0.47 (0.46–0.49) 6130 7.5 36.1 0.53 (0.51–0.55)
 LOS (median, IQR) 1 (1–3)   4 (1–17) 0.28 (0.27–0.28) 1 (1–4)   4 (1–15) 0.27 (0.27–0.28) 1 (1–3)   2 (1–10) 0.28 (0.27–0.28)
 Overnight stay 110,337 68.4 24.7 0.36 (0.35–0.36) 165,056 70.7 23.3 0.34 (0.34–0.35) 58,886 69.4 22.9 0.33 (0.32–0.33)
 Cost (mean, 95% CI)e 7457.3 (7370.1–7544.5) 14,157.5 (13,876.8–14,438.2)         
  1. Notes: Small cell counts (frequency <5), and/or proportions resulting from them are represented by "*" to maintain confidentiality
  2. a. Index injury admissions to all public and private hospitals, limited to residents within the relevant state
  3. b. Intersex/intermediate/unstated sex patient counts less than 5 added to the majority sex group to protect confidentiality
  4. c. Worst injury method-ICD-based Injury Severity Score less than or equal to 0.941 considered as serious injury
  5. d. Based on 157,866 patients for Victoria, 225,047 for NSW and 82,212 for WA (excludes patients who died or left against medical advice)
  6. e. Based on 123,207 patients with complete cost data
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