Massachusetts hospitals must reduce their levels of unnecessary care, particularly cesarean sections and avoidable admissions for asthma- and congestive heart failure-related complications, according to MassLive. A report from the state Center for Health Information and Analysis, set to be released this week, found a wide gap of 29 percent between the hospitals performing the most and fewest C-sections. The study also found hospital readmissions declined statewide from 15.9 percent to 15 percent between 2011 and 2013, but nearly a quarter of adults reported a preventable medical error in either their care or a loved one's in the last five years. Article