Validity and reliability of the Malay version of sleep apnea quality of life index – preliminary results

Abstract

BackgroundThe objective of this study was to determine the validity and reliability of the Malay translated Sleep Apnea Quality of Life Index (SAQLI) in patients with obstructive sleep apnea (OSA).MethodsIn this cross sectional study, the Malay version of SAQLI was administered to 82 OSA patients seen at the OSA Clinic, Hospital Universiti Sains Malaysia prior to their treatment. Additionally, the patients were asked to complete the Malay version of Medical Outcomes Study Short Form (SF-36). Twenty-three patients completed the Malay version of SAQLI again after 1–2 weeks to assess its reliability.ResultsInitial factor analysis of the 40-item Malay version of SAQLI resulted in four factors with eigenvalues >1. All items had factor loadings >0.5 but one of the factors was unstable with only two items. However, both items were maintained due to their high communalities and the analysis was repeated with a forced three factor solution. Variance accounted by the three factors was 78.17% with 9–18 items per factor. All items had primary loadings over 0.5 although the loadings were inconsistent with the proposed construct. The Cronbach’s alpha values were very high for all domains, >0.90. The instrument was able to discriminate between patients with mild or moderate and severe OSA. The Malay version of SAQLI correlated positively with the SF-36. The intraclass correlation coefficients for all domains were >0.90.ConclusionsIn light of these preliminary observations, we concluded that the Malay version of SAQLI has a high degree of internal consistency and concurrent validity albeit demonstrating a slightly different construct than the original version. The responsiveness of the questionnaire to changes in health-related quality of life following OSA treatment is yet to be determined.

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“…Findings from these three studies showed that patients with CLE score significantly lower on both the physical component score (mean ± SD score 41 ± 13] and the mental component score (mean ± SD score 39 ± 12) compared with the general U.S. population (mean ± SD score 50 ± 10) . The psychometric properties of the SF‐36 were not evaluated in patients with CLE, even although the instrument has demonstrated evidence of acceptable reliability (internal consistency), construct validity (convergent and known groups) and ability to detect change (responsiveness and sensitivity to change) in other dermatological diseases, as well as other disease states …”

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“…All this deteriorates the quality of life of patients who have the syndrome (4,5). The prevalence of this syndrome has increased in recent years (6,7,8,9,10), which has made it a public health problem (2,11). In addition, OSAHS is associated with multiple cardiovascular, metabolic and psychosocial complications that affect the quality of life (12,13).…”

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