Constructing overlapping cell tables to maximize the clinical usefulness of normative test data: rationale and an example from neuropsychology.

The author proposes a way of maximizing the clinical usefulness of limited normative test data through the use of overlapping cell norm tables. Adjacent cells differ in means, but overlap in range, and any one norm subject may appear in one or more adjacent cells. The neuropsychological test data of 363 nonclinical subjects are used to illustrate the approach.