The Response Scale for the Intellectual Disability Module of the WHOQOL: 5-Point or 3-Point?
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| Title: | The Response Scale for the Intellectual Disability Module of the WHOQOL: 5-Point or 3-Point? |
|---|---|
| Language: | English |
| Authors: | Fang, J., Fleck, M. P., Green, A., McVilly, K., Hao, Y., Tan, W., Fu, R., Power, M. |
| Source: | Journal of Intellectual Disability Research. Jun 2011 55(6):537-549. |
| Availability: | Wiley-Blackwell. 350 Main Street, Malden, MA 02148. Tel: 800-835-6770; Tel: 781-388-8598; Fax: 781-388-8232; e-mail: cs-journals@wiley.com; Web site: http://www.wiley.com/WileyCDA/ |
| Peer Reviewed: | Y |
| Page Count: | 13 |
| Publication Date: | 2011 |
| Document Type: | Journal Articles Reports - Evaluative |
| Descriptors: | Quality of Life, Likert Scales, Mental Retardation, Measures (Individuals), Item Response Theory, Factor Analysis, Correlation, Validity, Reliability |
| DOI: | 10.1111/j.1365-2788.2011.01401.x |
| ISSN: | 0964-2633 |
| Abstract: | Objective: To deal with the question of whether a 5-point response Likert scale should be changed to a 3-point scale when used in the field testing of people with intellectual disabilities (IDs), which was raised after the pilot study of World Health Organization Quality of Life (WHOQOL)-DIS, a module being developed with the World Health Organization measure of quality of life for disabilities. Methods: Three possible ways were used to generate hypothetical data by merging a 5-point scale into a 3-point scale. The analyses were based on both item response theory and classical measurement theory. The partial credit model for polytomous response was performed for item evaluation; the confirmatory factor analysis was used to check construct validity, the Cronbach's alpha for domain reliability, and correlation analyses for the relationship between the 5-point scale and the generated 3-point scale. Results: Most items with a 5-point response scale had disordered response options and/or unequal-length intervals between successive response options; these deficiencies were removed or improved without decline of validity and reliability in the hypothetical data of 3-point scales. Conclusion: Instead of the 5-point scale, a 3-point scale could be used for IDs in the field test of developing the module WHOQOL-DIS. |
| Abstractor: | As Provided |
| Number of References: | 17 |
| Entry Date: | 2011 |
| Accession Number: | EJ929065 |
| Database: | ERIC |
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| Abstract: | Objective: To deal with the question of whether a 5-point response Likert scale should be changed to a 3-point scale when used in the field testing of people with intellectual disabilities (IDs), which was raised after the pilot study of World Health Organization Quality of Life (WHOQOL)-DIS, a module being developed with the World Health Organization measure of quality of life for disabilities. Methods: Three possible ways were used to generate hypothetical data by merging a 5-point scale into a 3-point scale. The analyses were based on both item response theory and classical measurement theory. The partial credit model for polytomous response was performed for item evaluation; the confirmatory factor analysis was used to check construct validity, the Cronbach's alpha for domain reliability, and correlation analyses for the relationship between the 5-point scale and the generated 3-point scale. Results: Most items with a 5-point response scale had disordered response options and/or unequal-length intervals between successive response options; these deficiencies were removed or improved without decline of validity and reliability in the hypothetical data of 3-point scales. Conclusion: Instead of the 5-point scale, a 3-point scale could be used for IDs in the field test of developing the module WHOQOL-DIS. |
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| ISSN: | 0964-2633 |
| DOI: | 10.1111/j.1365-2788.2011.01401.x |
