Trends of mental health care utilization among US adults from 1999 to 2018

BACKGROUND: Mental health disorders affect millions of US adults, however, the trends and related factors for mental health care utilization in the US remain unknown. AIMS: Our study aimed to assess the trend of mental health utilization and related socio-demographic factors in the US. METHODS: The study included 55,052 individuals from the National Health and Nutrition Examination Survey (NHANES) in 1999–2018. Temporal trends in the percentages of mental health care utilizers were estimated across survey cycles. Trends and linked factors of mental health care utilization were assessed by a logistic regression model, while the non-linearity was estimated by restricted cubic splines. RESULTS: From 1999 to 2018, the percentage of mental health care utilizers in the US adult population increased from 7.0 to 11.3% (P < 0.001); meanwhile, the trends in males and females were consistent. The percentage increased positively with age in individuals aged 20–39 (P < 0.001) or aged 60 and over (P = 0.003). The trends were consistent in three race/ethnicity groups (P < 0.05). The logistic regression analysis revealed that several disparities existed in the subpopulations. Older age, female, lower family poverty-income ratio (PIR), chronic diseases, higher educational level, and smoking were estimated to be associated with a higher percentage of mental health care. CONCLUSIONS: The percentage of mental health care utilizers took on an increasing trend in the US adult population from 1999 to 2018. These trends were also observed in the subpopulations, but with disparities. Future research for exploring factors associated with mental health care utilizations is necessary. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12888-023-05156-2.