A controlled before-after study to evaluate the effect of a clinician led policy to reduce knee arthroscopy in NSW

Table 2 The number of knee arthroscopy pre- and post- intervention at intervention and control hospitals (public only)

Policy		Intervention 1	Control 1	Intervention 2	Control 2	Intervention 3	Control 3	Intervention 4	Control 4	All interventions (n = 4)	All control (n = 16)
Before^a	Sum	102	415	595	2080	410	1539	142	612	1249	4646
Before^a	Average	102	104	595	520	410	385	142	153	312	290
After	Sum	53	349	138	1181	133	1040	40	371	364	2941
	Average	53	87	138	295	133	260	40	93	91	184
	Follow up Period (months)	45	45	45	45	45	45	33	33	39	39

^aBoth Intervention and control hospitals have 5 year pre intervention data; the number of knee arthroscopy are rounded

ISSN: 1471-2474