The annual State of Health Care Quality Report from the National Committee for Quality Assurance focuses on quality issues health plans face in using evidence-based care. The 2015 report documents performance trends over time, tracks variation in care and recommends quality improvements based on data collected in 2014 by NCQA’s Healthcare Effectiveness Data and Information Set (HEDIS), a health plan performance improvement tool. The report summarizes the quality and consumer satisfaction results of health plans covering more than 171 million people, or 54 percent of the U.S. population. Among the 136 quality improvement measures in the report, NCQA showed that over three to five years, health plans had statistically significant improvements in performance on 46 measures (34 percent of the total) and plans had statistically significant declines in performance on 12 measures (9 percent of the total).