This study investigated the prevalence of psychoaffective immaturity and te
sted the hypothesis that it associated with bad prognosis. For 135 psychiat
ric patients meeting criteria for personality, neurotic, affective, substan
ce use, or psychotic disorders emotional immaturity was rated using the 198
5 diagnostic criteria of Doutheau, Dubertret, Moutin, and Barrois. 58 subje
cts (42.96%, 95% Confidence Interval: 34.61-51.31) were classified as immat
ure. Scores of the Nonimmature and Immature groups were compared for the Be
ck Depression Inventory and the Professional and Social Functioning Assessm
ent Scale. Scores were, respectively, significantly high er and lower in th
ose patients classified as Immature than those who were classified Nonimmat
ure. When depression was controlled by a covariance analysis, the mean diff
erence on the Professional and Social Functioning Assessment Scale remained
significant. It appears that psychoaffective immaturity is a factor associ
ated with severity of psychiatric disorders.