Hospital outcomes in major depression among older adults: differences by alcohol comorbidity.

OBJECTIVE: The prevalence of depression in older adults has been increasing over the last 20 years and is associated with economic costs in the form of treatment utilization and caregiving, including inpatient hospitalization. Comorbid alcohol diagnoses may serve as a complicating factor in inpatient admissions and may lead to overutilization of care and greater economic cost. This study sought to isolate the comorbidity effect of alcohol among older adult hospital admissions for depression.

METHODS: We analyzed a subsample (N = 8,480) of older adults (65+) from the 2010 Nationwide Inpatient Sample who were hospitalized with primary depression diagnoses, 7,741 of whom had depression only and 739 of whom also had a comorbid alcohol disorder. To address potential selection bias based on drinking and health status, propensity score matching was used to compare length of stay, total costs, and disposition between the two groups.

RESULTS: Bivariate analyses showed that older persons with depression and alcohol comorbidities were more often male (59.9% versus 34.0%, p <.001) and younger (70.9 versus 75.9 years, p <.001) than those with depression only. In terms of medical comorbidities, those with depression and alcohol disorders experienced more medical issues related to substance use (e.g., drug use diagnoses, liver disease, and suicidality; all p <.001), while those with depression only experienced more general medical problems (e.g., diabetes, renal failure, hypothyroid, and dementia; all p <.001). Propensity score matched models found that alcohol comorbidity was associated with shorter lengths of stay (on average 1.08 days, p <.02) and lower likelihood of post-hospitalization placement in a nursing home or other care facility (OR = 0.64, p <.001). No significant differences were found in overall costs or likelihood of discharge to a psychiatric hospital.

CONCLUSIONS: In older adults, depression with alcohol comorbidity does not lead to increased costs or higher levels of care after discharge. Comorbidity may lead to inpatient hospitalization at lower levels of severity, and depression with alcohol comorbidity may be qualitatively different than non-comorbid depression. Additionally, increased costs and negative outcomes in this population may occur at other levels of care such as outpatient services or emergency department visits.