Table 3.

Mean resource use and cost by APEX trial treatment group for total knee replacements (available cases)

	Intervention					Control
	N	Mean resource use	(SD)	Mean cost	(SD)	N	Mean resource use	(SD)	Mean cost	(SD)
Initial inpatient stay
Theatre time (in minutes)	142	102	32	£1,449	£453	145	103	32.9	£1,461	£469
Recovery time (in minutes)	140	94	44	£359	£169	136	104	69.1	£398	£265
Days in wards	147	5.9	3.9	£1,789	£1,224	149	5.2	2.9	£1,586	£1,034
Secondary care after initial discharge
Inpatient admissions after initial discharge a	103			£104	£533	110			£296	£907
Orthopaedics appointments	128	2.06	1.5	£209	£149	137	1.99	1.4	£202	£143
Physiotherapy appointments	128	0.44	2.1	£17	£82	137	0.40	1.3	£16	£50
Accident and emergency visits	128	0.16	0.7	£18	£84	137	0.18	1.2	£20	£145
Other appointments	128	0.00	0.0	£0	£0	137	0.03	0.2	£4	£34
Community Based resources
GP contacts combined	85	2.65	4.3	£84	£151	102	3.83	5.7	£122	£212
Nurse contacts combined	90	0.98	1.4	£14	£22	104	1.09	2.7	£16	£43
Occupational therapist contacts combined	95	0.28	1.1	£5	£19	105	0.25	1.3	£4	£22
Community physiotherapist contacts combined	90	1.03	2.7	£18	£45	107	1.29	3.5	£22	£60
Prescribed medications a	102			£61	£211	108			£48	£81
Total NHS cost b	70			£3,807	£1,277	78			£4,255	£1,804
Personal social services (PSS)
Home care worker (in hours)	135	1.17	12.9	£28	£310	136	1.24	14.4	£30	£346
Meals (food at home services)	132	0.14	1.6	£0	£5	129	0.11	1.2	£0	£4
Contacts with social worker	133	0.11	1.1	£4	£45	134	0.14	1.6	£7	£84
Home changes a	157			£3	£13	158			£1	£4
Total NHS+PSS cost b	70			£3,811	£1,276	75			£4,303	£2,102

^a The category combines different types of resource use, therefore an overall mean resource use could not be calculated

^b Total costs computed for patients with complete cost categories