Subtypes of schizophrenia and ABO blood types.

Determination of ABO blood types was carried out in 430 (171 female and 259 male) patients with hebephrenic schizophrenia and in 340 (155 female and 185 male) patients with paranoid schizophrenia. Results were compared with a random sample of 600 individuals (268 female and 332 male) drawn from the general population. No significant association was detected between any of the ABO blood phenotypes and affliction either with hebephrenic or paranoid schizophrenia