Substance use and psychiatric comorbidities among medical inpatients: associations with length of stay, health-related quality of life, and functioning, with consideration for gender

Abstract

Little is known about the impact of substance use and psychiatric comorbidities on the management and outcomes of medical inpatients. This study explores the influence of psychiatric comorbidities, and substance use (tobacco, alcohol, and cannabis) on the length of hospital stay (LOS), Health-Related Quality of Life (HRQoL), and functioning in 800 medical inpatients at a high-complexity academic hospital. Multivariate analyses demonstrated that psychiatric comorbidities were associated with reduced HRQoL (beta = -0.050, p-value = 0.017), and impaired functioning (beta = 3.4, p-value