Measurement Invariance of the Hospice Quality of Life Index-14 in Lung Cancer and Nonlung Cancer Patients Admitted to Hospice.

Abstract

Background and Purpose: Establishing measurement invariance (MI) is important in the questionnaire validation process. This study examined the MI of the Hospice Quality of Life Index-14 (HQLI-14) when comparing hospice patients with lung cancer and those with nonlung cancers. Methods: The HQLI-14 contains 14 items to measure multidimensional concepts of quality of life. A series of confirmatory factor analyses were performed to test configural, metric, and scalar invariance. Results: The MI of the HQLI-14 was supported by increasing equality constraints on item parameters between groups. Although the configural and metric invariances were both supported, one item regarding breathlessness was noninvariant between the groups with lung and nonlung cancers. Conclusions: The HQLI-14 shows early evidence of meeting the requirements for configural, metric, and partial scalar invariance. It may be used to make meaningful comparisons between patients with lung cancer and nonlung cancers.