Table 4.

Length-of-stay model coefficients and scoring system for the case-mix index

Characteristic	Model coefficient	Score
Age band
16–44 years	0	0
45–54 years	0.14	1
55–64 years	0.18	1
65–74 years	0.18	1
75–84 years	0.17	1
85 years and over	0.17	1
Charlson Comorbidity Index
0	0	0
1	0.13	1
2	0.20	1
3	0.26	2
4 and over	0.33	2
Hospital Frailty Risk Score
None	0	0
Mild	0.37	3
Moderate	0.97	7
Severe	1.32	9