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Halstead's Category Test: withstanding the test of time.

In spite of demonstrated validity, Halstead's Category Test has been criticized as overly time consuming. In order to evaluate this assumption, groups of severely head-injured and general neurological cases were administered the Category Test as part of routine evaluation, and the time to completion of the test was recorded. The results indicated that 93% of the patients completed the test in less than 1 h and that 50% completed it in less than 40 min. In 81% of the cases, the test lasted from 20-50 min.