[Trauma and psychosis--part 1. On the association of early childhood maltreatment in clinical populations with psychotic disorders].

A comprehensive literature stresses a high percentage of severe childhood maltreatment in the history of many psychotically ill patients treated in mental health services. Early childhood abuse seems to be associated among other things with a more severe clinical state, a more chronic course of illness and a more unfavourable psychosocial adaptation. In order not to jump to unwarranted causal conclusions, several conceptual und methodological problems have to be clarified before. From a conceptual perspective psychotic disorders diagnosed according to conventional criteria define only a minor subgroup within a much broader psychosis continuum in general population. Early childhood abuse has to be differentiated according to type, severity, timing, and context. The rates of early childhood abuse are high in general population. The methods of measurement of psychotic symptoms on the one side, of early trauma on the other side have to be critically evaluated. There is an empirically well founded association of childhood maltreatment and psychological and psychosomatic morbidity during adult years in general. In order to establish a potential conditional link also to psychotic disorders, clinical populations have to be compared to adequate control groups at least. A systematic literature search shows a very small number of studies including control groups at all. These studies underline that early childhood abuse may be significantly associated to the risk of psychosis indeed. The conditional role of early childhood abuse, however, has to be investigated only within a multifactorial biopsychosocial model of psychotic illness.