Depression and anxiety are two of the most common mental disorders treated in Integrated Primary and Behavioral Healthcare programs. We investigated the within and between performance differences of mental health counselors on anxiety and depressive symptomatology in an integrated service with a sample of 1573 clients and 10 licensed professional counselors. The results of growth curves within the framework of Multilevel Modeling showed significant within and between performance differences among counselors treating anxiety and depressive symptoms. Some counselors performed better in treating anxiety symptoms while others did better treating depression. Implications for counselor education, client care, and legislation are provided.
K E Y W O R D Sanxiety, depression, integrated primary and behavioral health care, therapist effect Anxiety and depressive disorders have been identified as the most common mental illnesses for decades among the general population (Demyttenaere, 2004;Spitzer et al., 1994; World Health Organization [WHO], 2017, 2022. According with the World Health Organization (Institute of Health Metrics and Evaluation, 2021) depression is a common disorder affecting about 280 million people worldwide, which represents an estimated 3.8% of the world population affected, including 5.0% adults and 5.7% older adults (>60 years). Anxiety disorders affect about 3.6% of 10-14-year-olds and 4.6% of 15-19-year-olds, and 3.8% of older adults worldwide (WHO, 2021). Furthermore, the global prevalence of depression and anxiety increased by a massive 25% in the first year of the COVID-19 pandemic (WHO, 2022a). Unfortunately, between 50% to a 75% of people in low-, middle-, and highincome countries receive no treatment or receive low-quality treatments (WHO, 2022b).The US 12-month prevalence of any anxiety and depressive disorder was 19.1% and 8.4%, respectively, among adult population in 2020 (National Institute of Mental Health [NIMH], 2022). Recent figures suggest that lifetime prevalence of generalized anxiety disorder is 3.7% (Ruscio et al., 2017) while lifetime prevalence of major depressive disorder is 20.6%