In the framework of a multi-national collaborative study carried out in eight countries, 768 chronic hospitalized schizophrenic patients were surveyed. Skin pigmentation was found to be present in 13 patients (1.7%), that is, within the same range (1-2.9%) of the initial reports. While the mean age and mean duration of hospitalization in the skin-pigmented population was slightly higher and larger than in the total population of our survey, no definitive relationships between sex, diagnosis, drugs and dosage of medication were revealed.
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