Validation of the Tagalog and Ilokano translations of the Functional Assessment of Cancer Therapy-General (FACT-G) scale for adult cancer center patients in a state-funded tertiary hospital.

Abstract

e18524 Background: Patient reported outcomes such as the health related quality of life (HRQOL) is a significant variable that should be used in clinical decision making and health policy. The Functional Assessment of Cancer Therapy - General (FACT-G), is one of the most widely used HRQOL questionnaires and to make it more accessible globally translation to local dialects are imperative for inclusive service delivery. Prior to use, the validity and reliability of these tools should be established for the population it is intended to cater. Consistent with the mission statement of the hospital the researcher wanted this service to be more accessible and equitable by addressing language differences for our non english speaking end-users. Hence, the study aimed to document validity and reliability of translated Tagalog and Ilokano versions of the FACT-G questionnaire for use in patients catered upon by the Baguio General Hospital and Medical Center (BGHMC). Methods: Psychometric evaluation of the above tools was done involving 384 adult cancer patients of BGHMC. Data management and analysis using SPSS software was used to evaluate reliability, face validity, content validity, and construct validity. An addition of cognitive interviews was done with end-users and subsequent thematic analysis aimed to improve questionnaire quality. Results: Both the Tagalog and Ilokano questionnaires had indices above the set value for reliability measured as Chronbach’s alpha of 0.968 and 0.974, content validity indices of 0.95 and 0.95, and face validity indices of 0.98 and 0.98, respectively. Construct validity was established through an exploratory factor analysis comprised of a principal components analysis and Varimax factor rotation with Kaiser normalization. Conclusions: The Tagalog and Ilokano questionnaires are reliable and valid tools for use of approximation of HRQOL of cancer patients catered by the BGHMC. With the results of the validation study it is recommended to incorporate the use of these translated questionnaires to the day to day health service provision to approximate the health-related quality of life of cancer patients. These can also be used as measures to evaluate interventions and policies that are directed towards cancer patients catered in Northern Luzon. To better these questionnaires the revised questionnaires includes the omission of the 7th item in the scale of general social and family well-being to minimize disruptions in rapport due to nature of the question. Another is the reversion of the 2nd item in the scale of general emotional well-being so that it would have the same direction on the approximation of HRQOL with the other items in the scale.