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Analysts used control charts to track relevant outcomes before and after the intervention. The chart displays a shift in data points, including several above the upper control limit, indicating statistically significant changes in the delivery process.
Before the intervention (January 1998 to June 1999), the chart shows a range of about 61 percent to nearly 65 percent of eligible members meeting the study criteria who were on bronchodilators and steroid inhalers. After the intervention (June 1999-October 2000), the chart shows a range of just over 64 percent to nearly 67 percent of eligible members on bronchodilators and steroid inhalers.
Internet Citation: Evaluating the Impact of Value-Based Purchasing: Figure 7. Overall Network Commercial (text description).
May 2002. Agency for Healthcare Research and Quality, Rockville, MD. http://archive.ahrq.gov/professionals/quality-patient-safety/quality-resources/value/valuebased/fig7desc.html
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