Although the clinical utilization of the Minnesota Multiphasic Personality Inventory (MMPI) in state hospitals is widespread, normative data have not been reported for this clinical group. Gough@) and Guthrie@) have reported the MMPI characteristics of selected diagnostic and other clinical groups, but such data pertained to individuals who may differ from state hospital patients in socio-economic, demographic, or other important respects. The present study reports MMPI characteristics of a large, well-defined clinical population3, with reference to several specific clinically relevant questions: (a) do diagnostic groups differ in MMPI characteristics such as profile configuration, elevation, etc.? (b) Does the factor of chronicity (length of hospitalization) have MMPI correlates? (c) Does age, as a variable, influence MMPI scores or configuration? METHOD Data will be reported for the following samples within the Fergus Falls State Acute group. As a part of the routine psychological test battery administered to all literate, testable, newly admitted patients under age 65, the MMPI was completed within five days following admission to the hospital. The first 187 males and the first 219 females so tested constitute the acute group. Diagnostically the males were distributed as follows: 67 schizophrenics, 28 affective psychotics (including involutional psychotic reactions), 16 neurotics, 54 personality disorders, and 21 of miscellaneous diagnoses. The female group consisted of 97 schizophrenics, 48 affective psychotics, 40 neurotics, 22 personality disorders and 12 of miscellaneous diagnoses. The age distribution for males ranged from 14 to 63 with a mean of 39.7 and a standard deviation of 13.51.