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Table 3 Area Under the ROC Curve for ISS and wISS in the test sample (NTDB 2007-2014)

From: A new weighted injury severity scoring system: better predictive power for adult trauma mortality

       ISS wISS Increase in AUC
ISS groups # patients # death % death AUC 95% CI AUC 95% CI
All Trauma Total 1-74 (all severity) 915,869 36,187 4.0 0.83 (0.83-0.83) 0.83 (0.83-0.83) 0.00
1-15 697,931 8,776 1.3 0.60 (0.60-0.61) 0.60 (0.60-0.61) 0.00
16-74 (major) 217,938 27,411 12.6 0.73 (0.73-0.74) 0.76 (0.76-0.77) 0.03
16-24 137,083 6,181 4.5 0.52 (0.52-0.53) 0.51 (0.50-0.51) -0.02
25-74 (critical) 80,855 21,230 26.3 0.53 (0.52-0.53) 0.68 (0.67-0.68) 0.15
Injury Type Blunt 1-74 (all severity) 770,884 28,272 3.7 0.82 (0.82-0.82) 0.82 (0.82-0.83) 0.00
1-15 576,492 7,064 1.2 0.60 (0.60-0.61) 0.60 (0.59-0.60) 0.00
16-74 (major) 194,392 21,208 10.9 0.74 (0.74-0.74) 0.77 (0.76-0.77) 0.03
16-24 124,796 4,995 4.0 0.50 (0.49-0.50) 0.52 (0.51-0.53) 0.02
25-74 (critical) 69,596 16,213 23.3 0.56 (0.55-0.56) 0.68 (0.68-0.69) 0.13
Penatrating 1-74 (all severity) 90,474 5,910 6.5 0.88 (0.88-0.89) 0.89 (0.89-0.90) 0.01
1-15 74,895 1,077 1.4 0.61 (0.59-0.63) 0.62 (0.60-0.64) 0.01
16-74 (major) 15,579 4,833 31.0 0.69 (0.69-0.70) 0.77 (0.77-0.78) 0.08
16-24 7,303 885 12.1 0.59 (0.57-0.61) 0.52 (0.50-0.54) -0.07
25-74 (critical) 8,276 3,948 47.7 0.49 (0.48-0.50) 0.73 (0.71-0.74) 0.23
Burn 1-74 (all severity) 14,881 618 4.2 0.87 (0.85-0.89) 0.87 (0.85-0.89) 0.00
1-15 13,763 244 1.8 0.73 (0.70-0.76) 0.73 (0.70-0.76) 0.00
16-74 (major) 1,118 374 33.5 0.69 (0.66-0.72) 0.70 (0.67-0.73) 0.02
16-24 554 89 16.1 0.52 (0.48-0.56) 0.51 (0.47-0.54) -0.02
25-74 (critical) 564 285 50.5 0.49 (0.46-0.52) 0.53 (0.49-0.56) 0.04
Isolated/poly Isolated trauma 1-74 (all severity) 262,969 5,473 2.1 0.74 (0.73-0.75) 0.75 (0.74-0.75) 0.01
1-15 242,937 3,158 1.3 0.60 (0.59-0.61) 0.62 (0.61-0.63) 0.01
16-74 (major) 20,032 2,315 11.6 0.75 (0.74-0.76) 0.76 (0.75-0.77) 0.01
16-24 14,452 663 4.6 0.50 (0.50-0.50) 0.51 (0.50-0.53) 0.01
25-74 (critical) 5,580 1,652 29.6 0.50 (0.50-0.50) 0.62 (0.61-0.63) 0.12
Polytrauma 1-74 (all severity) 652,900 30,714 4.7 0.84 (0.84-0.84) 0.84 (0.84-0.84) 0.00
1-15 454,994 5,618 1.2 0.61 (0.60-0.62) 0.61 (0.60-0.61) 0.00
16-74 (major) 197,906 25,096 12.7 0.74 (0.73-0.74) 0.76 (0.76-0.77) 0.03
16-24 122,631 5,518 4.5 0.52 (0.51-0.53) 0.51 (0.50-0.51) -0.02
25-74 (critical) 75,275 19,578 26.0 0.54 (0.54-0.55) 0.68 (0.67-0.68) 0.13
Age, years 18-44 1-74 (all severity) 412,218 11,713 2.8 0.86 (0.86-0.86) 0.86 (0.86-0.86) 0.00
1-15 321,398 2,133 0.7 0.56 (0.55-0.57) 0.56 (0.55-0.57) 0.00
16-74 (major) 90,820 9,580 10.6 0.76 (0.75-0.76) 0.78 (0.77-0.78) 0.02
16-24 53,119 1,452 2.7 0.54 (0.52-0.55) 0.54 (0.53-0.56) 0.01
25-74 (critical) 37,701 8,128 21.6 0.57 (0.56-0.58) 0.69 (0.68-0.69) 0.12
45-64 1-74 (all severity) 260,211 9,212 3.5 0.84 (0.84-0.85) 0.85 (0.84-0.85) 0.00
1-15 195,857 1,885 1.0 0.58 (0.57-0.59) 0.58 (0.57-0.60) 0.00
16-74 (major) 64,354 7,327 11.4 0.76 (0.76-0.77) 0.79 (0.79-0.80) 0.03
16-24 41,484 1,460 3.5 0.51 (0.50-0.53) 0.51 (0.50-0.53) 0.00
25-74 (critical) 22,870 5,867 25.7 0.56 (0.55-0.56) 0.70 (0.69-0.71) 0.14
65+ 1-74 (all severity) 243,440 15,262 6.3 0.79 (0.78-0.79) 0.79 (0.78-0.79) 0.00
1-15 180,676 4,758 2.6 0.59 (0.58-0.60) 0.59 (0.58-0.60) 0.00
16-74 (major) 62,764 10,504 16.7 0.73 (0.73-0.74) 0.73 (0.72-0.74) 0.00
16-24 42,480 3,269 7.7 0.52 (0.51-0.53) 0.52 (0.51-0.54) 0.00
25-74 (critical) 20,284 7,235 35.7 0.54 (0.53-0.54) 0.64 (0.63-0.65) 0.10
  1. AUC Areas under the receiver operating characteristic, ISS Injury severity score, CI Confidence interval