Table 3.

Unadjusted and adjusted coefficients of hospital volume for different outcome measures, expressed as odds ratio or beta per 10 patients

Outcome	OR per 10 patients	95% CI	P-value
In-hospital mortality
Unadjusted OR	1.63	0.98–2.71	0.06
Adjusted* OR	1.02	0.68–1.54	0.92
Adjusted* OR excluding referred patients	0.71	0.41–1.22	0.21
	Beta per 10 patients
Length of stay (days)
Unadjusted β	0.05	−0.01-0.11	0.11
Adjusted* β	0.03	− 0.03-0.09	0.33
Adjusted* β excluding referred patients	0.07	0.00–0.14	0.06
Critical care length of stay (days)
Unadjusted β	0.20	−0.25-0.65	0.39
Adjusted* β	−0.02	−2.84-2.80	0.93
Adjusted* β excluding referred patients	0.48	0.02–0.94	0.04
Time to operation (hours)
Unadjusted β	−0.25	−0.70-0.20	0.28
Adjusted* β	−0.24	−0.70-0.22	0.31
Adjusted* β excluding referred patients	−0.41	−0.97-0.15	0.15
Time to CT (hours)
Unadjusted β	−0.32	−0.61--0.03	0.03
Adjusted* β	−0.01	−0.02-0.004	0.16
Adjusted* β excluding referred patients	−0.03	− 0.08-0.02	0.22

*Adjusted for age, gender, age*gender (interaction term), ISS (spline), Revised Trauma Score, Charlson Comorbidity Index, penetrating injury, AIS head injury, referred patients (when not excluded)