“Pass-fail grading may reduce stress and increase group cohesion in medical students compared with traditional 5-interval grading.” (p.1443)

Rohe, D. E., Barrier, P. A., Clark, M. M., Cook, D. A., Vickers, K. S., & Decker, P. A. (2006). The Benefits of Pass-Fail Grading on Stress, Mood, and Group Cohesion in Medical Students. Mayo Clinic Proceedings, 81(11), 1443–1448. doi: 10.4065/81.11.1443