Using the Greenwood Yule method of analysis three groups of patients (schizophrenic, non-schizophrenic psychiatric, and medical controls) of comparable ages are examined for the variables of family size, birth rank, and ordinal position. No relationship of the two categories of illness to these variables has been demonstrated but there appears to be an excess of only children in the non-schizophrenic psychiatric group as against the schizophrenics.
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