High psychiatric impairment was found to be differentially distributed among sibship types by sex, with females from opposite sex sibships and males from same sex sibships being most impaired. For both sexes, the mixed sex sibships had the most negative outcome at the conclusion of therapy, although differences were small. Control analyses indicated that sex is not independently related to any given measure of psychiatric impairment or outcome, nor is there any sex bias in the direction of high or low impairment when sibship type is controlled. Thus, the differences in psychiatric status observed in these data appear to be associated with the combination of sex and sibling sex distribution.
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