ABSTRACT
Objective@#This study aims to determine the convergent and discriminant validity and internal consistent reliability of the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30 (EORTC QLQ-C30) Tagalog among adult Filipinos with differentiated thyroid cancer (DTC).@*Methodology@#104 adult Filipinos with DTC at various disease stages self-administered the EORTC QLQ-C30 version 3 Tagalog and Short Form-36 (SF-36) version 2 Tagalog. Concurrent validity between conceptually-related scales from both tools was determined. Convergent and discriminant validity of multi-item scales of the EORTC QLQ-C30 Tagalog were assessed by Spearman’s correlation. Cronbach's α was computed.@*Results@#The EORTC QLQ-C30 Tagalog showed moderate correlation with similar scales in the SF-36 Tagalog particulary for physical, role and social functioning, pain, and global health (r=0.42-0.48, p<0.001). It showed satisfactory item-domain convergent and discriminant validity for all scales except pain, fatigue, physical and cognitive functioning. Internal consistent reliability was good with cronbachs α ranging from 0.77 to 0.88 for global health, emotional and role functioning and symptom scale of nausea/vomiting.@*Conclusion@#The EORTC QLQ-C30 Tagalog had acceptable convergent and discriminant validity and internal consistent reliability for the scales of global health, role, social and emotional functioning and nausea/vomiting when applied among adult Filipinos with DTC.
Subject(s)
Thyroid Neoplasms , Quality of Life , Validation StudyABSTRACT
@#<p style="text-align: justify;"><strong>OBJECTIVES:</strong> The study aims to develop and validate a health-related quality of life (HRQoL) questionnaire for adult Filipinos with differentiated thyroid cancer (DTC) that can be used in combination with the European Organization for Research and Treatment of Cancer QLQ-C30 Questionnaire.<br /><strong>METHODOLOGY:</strong> The study had 4 phases. Phase I involved generation of HRQoL issues from literature review, focus group discussions with 6 DTC patients and 5 health care professionals (HCP). Subsequent assessment for relevance and importance of the HRQoL issues by 20 patients and HCP panel was done. Phase II was formulation of the HRQoL issues into questionnaire and subsequent translation into Filipino. Phase III was pilot testing of the questionnaire in 15 patients. Phase IV was validation of the pre-final questionnaire in 231 patients.<br /><strong>RESULTS:</strong> In Phase I, 28 HRQoL issues were generated. In Phase II, a 28-item Filipino questionnaire was created. In Phase III, 22 items that were not upsetting or confusing to patients and with good range of responses were retained. After Phase IV, a 22-item questionnaire with 5 conceptual scales (perceived fears, psychological distress/anxiety, functionality, voice complaints, neck complaints) was created.<br /><strong>CONCLUSIONS:</strong> The developed and validated 22-item questionnaire can be used to assess HRQoL issues in adult Filipinos with DTC.</p>