The number of first-year teachers who left their job for health reasons has increased twentyfold over the past 10 years, with most citing apparent emotional issues, an education ministry survey has found.

According to the survey, conducted on 25,743 public school teachers who began working in fiscal 2010, 101 voluntarily left within a year for "health" reasons, mainly depression and stress, compared with five in fiscal 2000.

Ninety-one of the 101 who quit were suffering emotional issues such as depression, the ministry said Tuesday.