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The Spelling, Word Reading and Numerical Operations subtests were administered. The Spelling test assesses spelling initially using letter to sound matching, progressing to single words that increase in difficulty. The Word Reading test assesses single word reading that starts with identifying letters, moves on to selecting words with similar sounds and then reading words that increase in complexity. Numerical Operations assesses the ability to solve numerical problems on paper. Beginning with number identification and counting, it progresses to simple and more complex mathematical problems. None of the tests are timed. Raw scores for all three subtests are converted to standard scores (M = 100, SD = 15). 

Wechsler D. Wechsler individual achievement test – second UK edition (WIAT-II). London, UK: Pearson; 2005.