Reliability and Validity of the Tagalog Version of the FACIT-Pal-14 Instrument in Measuring the Quality of Life of Filipino Cancer Patients.

Abstract

Background: Even though innumerable quality of life (QOL) questionnaires have been developed in palliative care, there is no gold standard assessment tool for QOL and no single questionnaire that fits all purposes and individuals. An important challenge to QOL assessments in palliative care is the highly diverse patient population with different diagnoses, disease states/prognosis, and languages. In an outpatient palliative care clinic population, FACIT-Pal-14 proved to be a valid and reliable scale in palliative care patients.

Objectives: We aimed to (i) determine the psychometric properties of the Tagalog version of the Functional Assessment of Chronic Illness Therapy - Palliative Care - 14 (FACIT-Pal-14) and (ii) measure the Quality of Life (QOL) of Filipino cancer patients.

Methods: This was a cross-sectional study. License for the use of the Tagalog version 4 of the FACIT-Pal-14 was requested from FACIT.org. To know the psychometric properties of the scales, Cronbach's alpha coefficient was used to assess reliability, and exploratory factor analysis, Pearson correlations, and independent samples T-test were used to determine validity.

Results: The Tagalog FACIT-Pal-14 was administered to 500 Filipino cancer patients consulting at the outpatient department of a training and regional medical center. The participants were mostly female (65.5%), aged 64 years and younger (82.6%), and had breast cancer (53.2%), colorectal cancer (19.2%), and lung cancer (9.4%). The mean Tagalog FACIT-Pal-14 score was 47.35 out of 56 (SD=7.14). The Cronbach's alpha coefficient of the Tagalog version of FACIT-Pal-14 was 0.784. Significantly lower mean Tagalog FACIT-Pal-14 scores were found in patients with Karnofsky Performance Status (KPS) 70 and lower, and Eastern Cooperative Oncology Group Performance Status (ECOG-PS) 2 and above compared with patients with KPS 80 and higher and ECOG-PS 0-1. (t=3.439, p<.001). While the Tagalog FACIT-Pal-14 scores, KPS, and ECOG scores only revealed a very weak, positive correlation (r=0.095; p <0.05), this ability to distinguish between groups known to differ regarding performance status showed the construct validity of the Tagalog FACIT-Pal-14.

Conclusions: In an outpatient oncology clinic population, the FACIT-Pal 14 showed evidence of reliability and construct validity for evaluating palliative care-specific QOL in Filipino cancer patients. Using this measure, Filipino cancer patients have a good QOL. Therefore, it is recommended that the Tagalog FACIT-Pal-14 be used on subsequent patient follow-ups to assess how their QOL would change over time so that the palliative care services provided will be suited to their needs.