Validity and reliability of the family inventory of needs (FIN): measuring the care needs of families of advanced cancer patients.

Two studies balanced qualitative and quantitative data to provide evidence of satisfactory validity and reliability of the Family Inventory of Needs (FIN). The FIN is designed to measure the importance of care needs of families of advanced cancer patients (FIN-Importance of Care Needs subscale) and the extent to which families perceive that their care needs have been met (FIN-Fulfillment of Care Needs subscale). The first study involved development of the instrument and testing for clarity, apparent internal consistency (non-quantitative assessment of homogeneity of content), and content validity using a panel of six experts (family members of advanced cancer patients). The FIN met or exceeded the preset criteria specified used in this phase of testing. The second study of the project used 109 family members of advanced cancer patients from three hospice programs to test the FIN for internal consistency and construct validity. Internal consistency of the FIN-Importance of Care Needs subscale as measured by Cronbach's alpha coefficient was .83 without redundancy. Construct analysis was assessed using factor analysis techniques. An inability to extract a substantively meaningful minimum number of factors, together with the fact that a theta reliability coefficient of .85 was obtained (only .02 higher than the alpha coefficient), suggested that the items were parallel supporting the conclusion that the subscale is unidimensional. Support for the construct validity of the FIN-Importance of Care Needs subscale was also obtained using predictive modeling. The internal structure of the FIN-Fulfillment of Care Needs subscale was assessed using cluster analysis. Results suggested that the subscale is a unidimensional one. Overall, the FIN met the preset reliability and validity criteria providing promising evidence for the instrument's sound psychometric properties for use in research and clinical settings.