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Table 2 Descriptive statistics of the classes of 1970, 1980 and 1990

From: The distribution and transitions of physicians in Japan: a 1974–2004 retrospective cohort study

   Class of 1970 Class of 1980 Class of 1990
Number of physicians in their fifth year of experience   2706 6326 6994
Females in their fifth year of experience (%)   9 11 18
Average age at first registration (± SD)   26.3 (2.2) 26.7 (2.7) 26.7 (2.7)
Work facility in their fifth year of experience (%) Clinics 5 4 3
  Hospitals 91 93 94
  Others 4 4 3
Average frequency of lifetime specialty changes (± SD)   1.5 (2.0) 0.8 (1.3) 0.4 (0.8)
Percentage of physicians changing specialties more than once (%)   53 38 27