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Interprofessional (IP) experiences are increasing in frequency and scope in health professions education, though little is known about the role of the co-curricular environment in fostering students’ attitudes towards IP collaboration. We examined if participants in IP co-curricular activities of substantive duration held attitudes toward IP learning and collaboration differently than students who did not participate in such activities. We distributed a questionnaire composed of the Readiness for Interprofessional Learning Scale (RIPLS) and the Interdisciplinary Education Perception Scale (IEPS) to the 2008, 2009, and 2010 graduates of an academic health center. Respondents indicated if they participated in any of the six substantive IP co-curricular activities offered by the institution. Respondents were grouped by participation in “one or more IP activity” or “no participation.” Independent sample T-tests were performed for each of the RIPLS and IEPS scales to assess differences between those groups. 997 (58.1%) of the graduates completed the survey; 52.9% of the respondents reporting participation in at least one IP activity. Of the seven scales from the two instruments, the mean scores of one scale were significantly different between the two groups: IEPS “perceived need for cooperation” (p