Identification of outliers and positive deviants for healthcare improvement: looking for high performers in hypoglycemia safety in patients with diabetes

Table 1 Correlation coefficients with p-values for overtreatment and undertreatment rates for each year and overtreatment threshold. For overtreatment thresholds 6.5% and 7%, significant negative correlation between overtreatment rates and undertreatment rates was observed across all years; using 6% as the overtreatment threshold, correlations were negative but of lower magnitude and significance

		Separated by 1 year				Separated by 2 years			Separated by 3 years		Separated by 4 years
Comparator	A1c threshold	2009–2010	2010–2011	2011–2012	2012–2013	2009–2011	2010–2012	2011–2013	2009–2012	2010–2013	2009–2013
All VA Facilities	6%	0.67	0.72	0.82	0.8	0.54	0.61	0.58	0.4	0.45	0.29
	6.5%	0.66	0.67	0.8	0.8	0.5	0.53	0.57	0.41	0.39	0.35
	7%	0.66	0.67	0.82	0.76	0.5	0.51	0.58	0.41	0.38	0.34
Facilities within complexity level	6%	0.67	0.72	0.81	0.8	0.56	0.62	0.57	0.42	0.44	0.31
	6.5%	0.66	0.69	0.8	0.8	0.52	0.54	0.56	0.42	0.39	0.37
	7%	0.66	0.68	0.83	0.76	0.52	0.53	0.59	0.42	0.39	0.37
Facilities within VISN	6%	0.62	0.64	0.78	0.75	0.46	0.48	0.5	0.27	0.3	0.15
	6.5%	0.66	0.61	0.77	0.75	0.47	0.45	0.49	0.32	0.26	0.25
	7%	0.69	0.61	0.81	0.74	0.51	0.44	0.56	0.4	0.29	0.31

ISSN: 1472-6963