Could test length or order affect scores on Letter Number Sequencing of the WAIS-III and WMS-III? Ruling out effects of fatigue

The Letter Number Sequencing subtest of the WAIS-III and WMS-III was admini stered at the end of the standardization edition of the WMS-III. It was not administered as part of the WAIS-III standardization battery. Nevertheless , the subtest was included in the published version of the WAIS-III. This s tudy examines differences between examinees administered the Letter Number Sequencing subtest at three different times during a psychological battery: (1) as part of the published battery, (2) as part of the WMS-III when the WMS-III was administered as the first test in a sequence, and (3) as part o f the WMS-III standardization when the WAIS-III was administered immediatel y preceding the WMS-III. The participants were 372 examinees (n = 124 in ea ch condition) who were matched on key demographic variables. A repeated mea sures MANOVA yielded no difference in subtest scores when administered in a ny of these conditions. The results show no evidence of fatigue or ordering effects on the Letter Number Sequencing subtest.