Evaluation of content validity for the FACT-G quality of life questionaire through multidimensional escalation techniques

Authors

  • Ricardo Sánchez Instituto Nacional de Cancerología
  • Mónica Ballesteros Instituto Nacional de Cancerología
  • Natascha Ortiz Instituto Nacional de Cancerología

Keywords:

Quality of life, neoplasms, questionnaires, validation studies
Abstract Authors References How to Cite

Abstract

Objective: To evaluate the structure of FACT-G latent variables in a sample of patients attending the National Cancer Institute of Colombia
Methods: The FACT-G questionnaire was applied in 473 patients with different types of cancer during 2005-2007. A factor analysis was done based on a polychoric matrix and multidimensional escalation techniques for ordinal variables determining the domain structure of the questionnaire.
Results: Breast and prostate cancer were the most frequent types of tumors. In total 54.6% were men and the mean age was 61 years (SD 11.7). The four domains of the questionnaire revealed a similar score. The factor analysis showed a similar structure to the original FACT-G with the emotional function as the less consistent domain. According to the multidimensional escalation analysis, a bidimensional structure is suitable after different adjustment indexes. Only the emotional function domain exposed a heterogeneous structure; the remaining revealed clustered structures and independence among them. Central components for quality of life were functional well-being and social/family well-being.
Conclusions: The FACT-G quality of life questionnaire applied in a sample of Colombian patients was consistent wit the original instrument. The multidimensional escalation techniques provide additional information to conventional analysis and are useful to validate quality of life questionnaires.

Author Biographies

Ricardo Sánchez, Instituto Nacional de Cancerología

Grupo de Investigación Clínica, Instituto Nacional de Cancerología, Bogotá, D.C., Colombia
Universidad Nacional de Colombia, Bogotá D.C., Colombia

Mónica Ballesteros, Instituto Nacional de Cancerología

Grupo de Investigación Clínica, Instituto Nacional de Cancerología, Bogotá, D.C., Colombia

Natascha Ortiz, Instituto Nacional de Cancerología

Grupo de Investigación Clínica, Instituto Nacional de Cancerología, Bogotá, D.C., Colombia

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How to Cite

[1]
Sánchez, R. et al. 2010. Evaluation of content validity for the FACT-G quality of life questionaire through multidimensional escalation techniques. Revista Colombiana de Cancerología. 14, 4 (Dec. 2010), 225–233.

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Published

2010-12-01

Issue

Vol. 14 No. 4 (2010)

Section

Research/original articles

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