IMP-ICDX: an injury mortality prediction based on ICD-10-CM codes

Table 4 IMP-ICDX regression coefficients

Predictor		Coefficient	Robust std. error	Z	P > \|Z\|	95% CI
WMDP₁	C₁	4.9695	0.1198	41.49	0.000	4.7348–5.2043
WMDP₂	C₂	2.2315	0.2467	9.04	0.000	1.7479–2.7151
WMDP₃	C₃	0.4111	0.1215	3.38	0.001	0.1730–0.6492
WMDP₄	C₄	0.3107	0.1418	2.19	0.028	0.0328–0.5885
WMDP₅	C₅	0.3905	0.1318	2.96	0.003	0.1322–0.6488
WMDP₁ × WMDP₂	C₆	− 0.7551	0.1428	− 5.29	0.000	− 1.0349 to − 0.4753
Same region	C₇	− 0.2120	0.0488	− 4.34	0.000	− 0.3076 to − 0.1163
ln (NBR)	C₈	− 2.4871	0.1942	− 12.80	0.000	− 2.8678 to − 2.1064
NBR^0.382	C₉	2.6147	0.2331	11.22	0.000	2.1578–3.0715
Constant	C₀	− 10.7138	0.2630	− 40.73	0.000	− 11.2293 to − 10.1983

Coefficients for IMP-ICDX model were recalculated based on all 158,956 patients not used to calculate WMDP and IMP-ICDX values. WMDP₁ indicates the worst injury (greatest WMDP value), WMDP₂ the second worst injury, and so on. WMDP₁ × WMDP₂ is the product of the WMDP values for the 2 worst injuries. Same region is equal to 1 if the two worst injuries are in the same body region, 0 otherwise. NBR is the number of body regions for each injured patient. “ln” indicates natural logarithm

ISSN: 1749-7922