An Evaluation of the Feldman Prognosis Scale for Shock Therapy

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Abstract
Feldman (1951) published a scale for predicting the response of patients to E.C.T. and insulin coma therapy. Using only Minnesota Multiphasic Personality Inventory profiles meeting stated requirements (at least one elevated scale, moderate F scale scores, etc.) he carried out an item analysis of the M.M.P.I. responses of 42 patients who had responded well to shock therapy and 42 patients who had remained unimproved (psychiatrists' ratings). He derived a 52-item scale, scored as an additional M.M.P.I. scale and labelled Ps, high scores indicating poor prognosis. This he cross-validated on a further 100 patients (categorized as recovered, improved or unimproved) and all categories were well discriminated by Ps scale scores.

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