Statistical Ratings

Each HEDIS measure collected by commercial HMOs was compared to the commercial state average for that measure. Each measure was then given a statistical rating depending on whether that HMO’s performance was above, the same as, or below the state average. The 95% confidence interval was used to determine statistically significant differences between an HMO’s score and the state average. Three stars indicate that an HMO’s performance on a particular measure is significantly above the state average, while one star means that an HMO’s performance is significantly below the state average. Two stars indicate that an HMO’s performance on a particular measure is not significantly different from the state average for that measure.

	Higher	HMO score is significantly above the average for Utah HMOs
	Average	HMO score is neither higher nor lower than the average for Utah HMOs
	Lower	HMO score is significantly below the average for Utah HMOs

Note: Statistical ratings were not computed for Medicaid and CHIP HMOs since only two plans in each program reported HEDIS measures in 2007