Inpatient psychiatric units in nonteaching general hospitals. Response to public mental health policy or hospital economics?

The purpose of the study was to determine the extent to which the existence of inpatient psychiatric units (IPU) in general hospitals is related to patient service "needs," to certain economic and organizational characteristics of general hospitals, or to both. Area and institutional characteristics of general hospitals in Massachusetts were analyzed with multivariate techniques. Interviews were also conducted with representatives from hospitals and the Massachusetts Department of Mental Health in three mental health catchment areas. Most of the teaching hospitals in the state have IPUs. The study indicated that a statistical difference exists between characteristics of IPU and non-IPU nonteaching general hospitals. The probability that a nonteaching general hospital will have an IPU is related to both market conditions and institutional characteristics of the hospital. Nonteaching general hospitals with IPUs were more likely to be located in areas with higher incomes but fewer office-based psychiatrists per capita. IPU hospitals were also more likely to be larger and to receive a higher percent of their revenues from Medicaid than their non-IPU counterparts. The study did not provide evidence that "need" as defined by traditional indicators was an influential factor in IPU existence.