Perceived discrimination and mental health in the Japanese general population

Research has shown that discrimination is prevalent in many countries and associated with poorer mental health. However, little is known about discrimination and its effects in Japan.

To address this deficit this study examined the association between perceived discrimination and mental health outcomes in the Japanese general population and the role of general stress in these associations.

Data were analyzed from 1,245 individuals (age 18-89) that were collected in an online survey in 2021. Perceived discrimination was assessed with a single-item measure as was lifetime suicidal ideation. Depressive and anxiety symptoms were respectively measured with the Patient Health Questionnaire (PHQ-9) and Generalized Anxiety Disorder-7 (GAD-7) scale. General stress was assessed with the Perceived Stress Scale (PSS-14). Logistic regression was used to assess associations.

Perceived discrimination was prevalent (31.6%) in the study sample. In fully adjusted analyses discrimination was associated with all of the mental health outcomes/general stress with odds ratios (ORs) ranging from 2.78 (suicidal ideation) to 6.09 (general stress) among individuals with a high level of discrimination. When the analyses were adjusted for general stress (as a continuous score) there was a large reduction in the ORs although high discrimination continued to be significantly associated with anxiety (OR: 2.21), while a mid level of discrimination was related to depressive symptoms (OR: 1.87) and had a borderline association with suicidal ideation.

Perceived discrimination is common in the Japanese general population and associated with worse mental health, with stress possibly playing a role in this association.