In the last 10 years, the average number of serious deficiencies cited in nursing home inspections in Connecticut has dropped by 50 percent, while reported nurse staffing levels have risen, and reports of residents injured by lapses in care have declined, federal data show. But a new report from the U.S. Government Accountability Office (GAO) questions whether those measures – many of them self-reported by nursing homes – accurately reflect improvements in nursing home care, or instead are due to deficiencies in reporting and oversight. The GAO notes that the average number of consumer complaints per nursing home actually has climbed in 30 states since 2005, including a 20 percent increase in Connecticut. The ability of the federal Centers for Medicare & Medicaid Services (CMS) to assess nursing home quality “is complicated by various issues with these data, which make it difficult to determine whether observed trends reflect actual changes in quality, data issues, or both,” the GAO said. The agency said that self-reporting of some of the data is among the problems that could undermine CMS’s much-touted Nursing Home Compare program, which rates nursing homes on a ‘five-star’ scale and is intended to help guide consumers’ decisions.