Measuring safety culture in health care organizations remains a key step in improving patient safety. Many hospitals use the validated Agency for Healthcare Research and Quality's (AHRQ) Hospital Survey on Patient Safety Culture to assess safety culture at the hospital and unit levels. This report, building on 2007 and 2008 versions, presents baseline survey data from more than 600 hospitals to create benchmarks for comparison of different regions, hospital types, hospital size, respondent work areas, and staff positions. This report is the first to provide results showing change over time for 204 hospitals that submitted data more than once.