“…Lasek, Barkley, Harper, and Rosenthal (1997) found that patients who completed hospital opinion surveys were more likely than non-respondents to be female, older, married, and report their health status as better. These demographic characteristics also influence patients’ evaluation of their care (Brown et al, 2008; Hargraves et al, 2001; Kravitz, 2001); patients who complete hospital surveys are also more likely to have positive perceptions of their hospital experience (Mazor, Clauser, Field, Yood, & Gurwitz, 2002; Perneger, Chamot, & Bovier, 2005). Consequently, the patients who participated in our study may not be representative of all patients admitted to the same unit.…”