International comparison of the prevalence of psychosomatic disorders in schizophrenic patients

An epidemiological survey was carried out in Montreal (Canada). Plattsburgh (USA) and Lodz (Poland) to test the hypothesis that certain psychosomatic disorders show a low lifetime prevalence in schizophrenic patients (total n = 665). The same method for collection and evaluation of demographic and clinical data was used in order to establish the lifetime prevalence of peptic ulcer (PU), bronchial asthma (BA), neurodermatitis (ND) and rheumatoid arthritis (RA) in the patients as well as in their nuclear families. Low values of lifetime prevalence were found in schizophrenic patients in chronic hospitals as compared with those in general-university hospitals. Similarities were found in age- and sex-related patterns of these psychosomatic disorders in both samples. However, PU showed higher prevalence, and BA, ND and RA showed lower prevalence in the Polish sample.