FAMILIAL AGGREGATION OF SPELLING DISABILITY

This study examined the familial aggregation of spelling disability in a sample of 32 German school-aged children and their relatives. The i nfluence of two different diagnostic criteria (low-achievement criteri on, and regression-based IQ-discrepancy criterion) on the rate of affe ctedness was investigated. Results revealed that 52.3-61.9% of the sib s and 26-34% of the parents were spelling disabled. Little evidence wa s found for an influence of the diagnostic criterion on the rate of af fectedness. Copyright (C) 1996 Association for Child Psychology and Ps ychiatry.