is pleased to release the most current nationally representative data on ambulatory care visits to hospital emergency departments (ED) in the United States. Statistics are presented on selected hospital, patient, and visit characteristics based on data collected in the 2011 National Hospital Ambulatory Medical Care Survey (NHAMCS). NHAMCS is an annual nationally representative sample survey of visits to EDs, outpatient departments, and ambulatory surgical centers (ASCs) of nonfederal short-stay and general hospitals (starting in 2009), as well as freestanding ASCs (starting in 2010). The sampling frame for the 2011 NHAMCS was constructed from SDI's "Healthcare Market Index, Updated July 15, 2006" and "Hospital Market Profiling Solution, Second Quarter, 2006." NHAMCS uses a multi-stage probability design with samples of primary sampling units (PSUs), hospitals within PSUs, and patient visits within emergency service areas (ESAs). A total of 483 hospitals were selected for the 2011 NHAMCS, of which 370 were in scope and had eligible EDs. Of these, 322 participated, yielding an unweighted ED response rate of 87.0 percent. All 419 emergency services areas (ESAs) were selected from the EDs. Of these, 387 responded fully or adequately by providing forms for at least half of their expected visits based on the total number of visits during the reporting period, and 5 responded minimally (i.e., they provided fewer than half of their expected forms). In all, 31,084 Patient Record forms (PRFs) were submitted. The resulting unweighted ESA sample response rate was 92.4 percent, and the overall unweighted two stage sampling response rate was 80.4 percent (81.3% weighted). Response rates have been adjusted to exclude minimal participants.
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