Dimensional versus categorical use of the PHQ-9 depression scale among persons with non-small-cell lung cancer: a pilot study including quality-of-life comparisons.

Abstract

The debate over the relative usefulness of categorical (yes/no) versus dimensional (continuous scales) assessments for determining mental illness has been running strong for nearly a half century. In order to address the utility of each of these assessment methods within the cancer population, in the present study, the dimensional and categorical scoring… (More)

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