Using strict research diagnosis criteria, the authors found a hospital
admission prevalence of schizophrenia of about 6%. Other recent studies
yielded similar figures, with correspondingly low figures for the morbid
risk of schizophrenia in the general population and in the relatives of
schizophrenic probands. In view of the data supporting the validity of this
"narrow" concept of schizophrenia, the authors suggest that the true
prevalence of schizophrenia is much lower than generally accepted.