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.