<p><advertisement></advertisement>Massachusetts hospitals as a whole outperform hospitals across the country on the quality of outpatient care, including providing fast treatment to emergency room patients with chest pain and protecting surgery patients from infections, according to new federal data.The Centers for Medicare and Medicaid Services released data yesterday that for the first time show how well hospitals care for patients on nine different measures of outpatient care. Since 2005, the agency has provided information on the quality of care hospitals provide overnight patients.</p>