Abstract
OBJECTIVE—The 40 item amyotrophic lateral sclerosis assessment questionnaire (ALSAQ-40) is a subjective health measure designed specifically to assess areas of importance to patients with ALS. It was designed for use in surveys and clinical trials of this patient group, and has been assessed for reliability and validity. Despite its relative brevity there are situations where an even shorter form of the instrument would be desirable. Consequently, this paper reports a process of item reduction which results in a brief five item version of the instrument. METHODS—Data from two surveys of patients with ALS who completed the ALSAQ-40 were analysed to develop a short form ALSAQ. Questionnaire items were correlated with their dimension total scores. Highly correlated items were transformed onto a scale from 0 to 100 and results compared with the parent dimension. RESULTS—Five items were selected that produced results that closely resembled those of the five dimension scores of the ALSAQ-40. CONCLUSIONS—Results on the new measure compared with the parent ("gold standard") ALSAQ-40 suggest that the measure can produce similar results to the longer form but with considerable economy.
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Selected References
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- Coste J., Guillemin F., Pouchot J., Fermanian J. Methodological approaches to shortening composite measurement scales. J Clin Epidemiol. 1997 Mar;50(3):247–252. doi: 10.1016/s0895-4356(96)00363-0. [DOI] [PubMed] [Google Scholar]
- Jenkinson C., Fitzpatrick R., Brennan C., Swash M. Evidence for the validity and reliability of the ALS assessment questionnaire: the ALSAQ-40. Amyotroph Lateral Scler Other Motor Neuron Disord. 1999 Dec;1(1):33–40. doi: 10.1080/146608299300080022. [DOI] [PubMed] [Google Scholar]
- Nelson E. C., Landgraf J. M., Hays R. D., Wasson J. H., Kirk J. W. The functional status of patients. How can it be measured in physicians' offices? Med Care. 1990 Dec;28(12):1111–1126. [PubMed] [Google Scholar]
- Scheltens P. Early diagnosis of dementia: neuroimaging. J Neurol. 1999 Jan;246(1):16–20. doi: 10.1007/s004150050300. [DOI] [PubMed] [Google Scholar]
- Wasson J., Keller A., Rubenstein L., Hays R., Nelson E., Johnson D. Benefits and obstacles of health status assessment in ambulatory settings. The clinician's point of view. The Dartmouth Primary Care COOP Project. Med Care. 1992 May;30(5 Suppl):MS42–MS49. doi: 10.1097/00005650-199205001-00004. [DOI] [PubMed] [Google Scholar]