Fig. 3From: Education policies to increase rural physicians in Japan: a nationwide cohort studyRetention rate for contractual workforce. The retention rate is the percentage of graduates who did not buy out the received scholarship (or for Jichi student, tuition). The retention was calculated in the direct method of survival analysis except for those who graduated between 2014 and 2019 (F) which was calculated with the Kaplan–Meier methodBack to article page