Scatter within subtests on the WISC-IV is interpreted differently that differences between WISC-IV index scores and performance scores.
For DD's testing, her WISC verbal comprehension index was 2-3 sigma higher (so more than 45 points in some cases) than verbal subtests on the WAIT. When paired with low phonological processing (25 percentile) on the C-TOPP, this lead to the dyslexia & dysgraphia diagnoses. Lower working memory was considered a contributing factor for DD's struggles, but was not a component of the diagnosis.
Our school is accepting this and has put DD on an IEP as a result. However, 12 months ago they wouldn't. They would have laughed me out of the room. The school is cowering in fear from the state's department of ed because of past misdeeds in refusing help to children. I believe that 12th percentile performance would have been above their cutoff for granting an IEP because they wouldn't consider the child's cognitive abilities.
