PhD studies hurt mental health, but less than you think

We study the mental health of PhD students in Sweden using comprehensive administrative data on prescriptions, specialist care visits, hospitalizations, and causes of death. We find about 7% (5%) of PhD students receive medication or diagnosis for depression (anxiety) in a given year. These prevalence rates are less than one-third of the corresponding survey-based prevalence rates reported in the literature, and even after adjusting for difference in methodology, 44% (72%) of the prevalence rates reported in the literature. We also document PhD students' mental health significantly worsens relative to their peers after they have entered the program. This deterioration is consistent with doctoral studies having a negative causal effect on mental health.