Table 3

Characteristics of preintervention and postintervention patient groups

Characteristic	Preintervention (n=941)	Postintervention^*
Characteristic	Preintervention (n=941)	Phase 1 (n=2314)	Phase 2 (n=2209)	Phase 3 (n=2412)	Phase 4 (n=1728)
Age, median years	52	50	51	52	51
Caucasian, proportion	0.23	0.26	0.24	0.23	0.25
Female, proportion	0.43	0.43	0.45	0.45	0.44
Medicaid or self-pay, proportion	0.42	0.41	0.42	0.41	0.39
Comorbidities per patient, median number	8	9	9	9	7
Principal diagnoses, proportion
Heart failure	0.072	0.060	0.082	0.079	0.076
Acute kidney injury	0.028	0.034	0.030	0.034	0.022
HIV	0.025	0.040	0.031	0.037	0.013

↵* Study phases are as follows: baseline 23 May to 30 June 2007; phase 1: 1 July to 30 September 2007; phase 2: 1 October to 31 December 2007; phase 3: 1 January to 31 March 2008; phase 4: 1 April to 30 June 2008.