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The article presents a study that examines sex chromatin deviations among school children in special classes in Sweden. The investigation was carried out with the permission of the chief school medical officer in Gothenburg, who received reports of the pathological findings. All children were examined in their classes with the help of the school nurse. Each child examined received a serial number and this was the only identification sign for the smear preparation. At the time of the investigation, all the girls with double Barr bodies were placed in remedial classes.

The article examines the prevalence of double Barr bodies among female inmates of mental hospitals in Sweden. The study utilized buccal mocusa smears from female patients at four mental hospitals in the country. About 50 suitable cells in each specimen were examined with a special look out for double Barr bodies. The results indicated that six of the 1,589 women examined had double Barr bodies which are equal to a prevalence of 1 per 263 patients or .38 percent. It was suggested that the triple X state which is seen from buccal smears is more prevalent among females in ordinary mental hospitals than in the general population.