Factor and cluster analysis of the intermediate Halstead Category Test

The factorial invariance of the six subtests of the Intermediate version of the Halstead Category Test (IHCT), as well as clusters of IHCT subtest patterns, were evaluated in a sample of 87 children with traumatic brain injuries. A two-factor solution was found which partially replicated that found in previous research with children with learning disabilities, supporting the assumption that the IHCT measures multiple underlying constructs in clinical populations. Four clusters were found, with differences between clusters determined to a substantial extent by relative accuracy on subtest III, and to a less substantial extent by relative accuracy on subtests IV and V Clinical and research implications are discussed.