Analytic Considerations about Observed Distribution of Age of Onset in Schizophrenia

In the light of a possible use of age correction in future genetic studies of schizophrenia, we attempted to evaluate the existence of factors influencing a frequency distribution of age related at the onset of the disease. Among the variables we chose for the analysis, some of these, sex diagnosis number of siblings of the patients and position of the patient in the sibship, have been found to be significant according to the Cox’s regression model we used.