Table 2

Result of cost stepwise linear regression

Model summary
Model	R	R²	Adjusted R²	SE of the estimate
21	0.716	0.513	0.509	0.24262

Coefficients*
Model		Unstandardised coefficients		Standardised coefficients	t	Significance	95 CI for B
Model		B	SE	Beta	t	Significance	Lower bound	Upper bound
21	(Constant)	8.929	0.048		184.830	0.000	8.834	9.024
	Readmission	0.568	0.022	0.377	26.024	0.000	0.525	0.611
	Complication	0.273	0.022	0.200	12.325	0.000	0.230	0.317
Unit care	Intensive	0.432	0.033	0.204	13.066	0.000	0.367	0.497
	Geriatric	0.283	0.029	0.153	9.582	0.000	0.225	0.340
	Inpatient geriatric liaison	0.106	0.020	0.085	5.370	0.000	0.067	0.145
Charlson index	1	0.034	0.012	0.040	2.714	0.007	0.009	0.058
	2	0.047	0.018	0.038	2.566	0.010	0.011	0.083
	3	0.116	0.029	0.059	4.005	0.000	0.059	0.173
	4	0.137	0.040	0.052	3.409	0.001	0.058	0.216
	5	0.144	0.039	0.055	3.643	0.000	0.066	0.221
Days between admission day and operating day	1	0.129	0.011	0.185	11.555	0.000	0.107	0.151
	2	0.140	0.028	0.083	5.019	0.000	0.086	0.195
	3	0.188	0.034	0.089	5.584	0.000	0.122	0.254
	4	0.338	0.028	0.206	12.238	0.000	0.284	0.393
Diagnosis	Osteoarthritis	−0.092	0.024	−0.112	−3.794	0.000	−0.139	−0.044
Physiotherapy session	4	0.145	0.024	0.088	6.091	0.000	0.099	0.192
Emergency	Without ambulance	−0.072	0.025	−0.082	−2.912	0.004	−0.120	−0.024
Destination	Deceased	−0.181	0.052	−0.057	−3.470	0.001	−0.283	−0.079
	Transfer to care home	−0.062	0.020	−0.051	−3.087	0.002	−0.101	−0.023
	Transfer to hospital	0.140	0.020	0.105	6.967	0.000	0.100	0.179
Age	51–60 years old	−0.044	0.014	−0.045	−3.115	0.002	−0.072	−0.016

*Dependent variable: LN_cost.