Woodcock-Johnson Tests of Achievement – Fourth Edition (WJ-4)
The WJ-427provides assessment of academic achievement across the domains of reading, written language, and mathematics. For this screening program, the Letter-Word Identification subtest was used to briefly assess reading while the Spelling subtest was used to measure verbal encoding. For the mathematics domain, the first 14 participants completed the Applied Problems subtest after which, to reduce screener duration, the Calculation subtest was substituted. Post-hoc analysis did not suggest significant differences between sores on these two tests. Depending on math subtest, WJ-4 scoring software provided either a Brief Achievement Score or Academic Skills Score; this sum score was used for each participant as a proxy for overall academic functioning (reported as “mean academic score”). All subtest and summary scores are calculated as standard scores with a mean of 100 and a SD of 15. The WJ-4 demonstrates generally appropriate psychometric properties28.