Development and validation of a short version of the Stroke-Specific Quality of Life Scale
Résumé
Background and purpose The Stroke-Specific Quality of Life scale (SS-QoL) is a well-validated measure of Health-related Quality of Life in patients with stroke, but, with 49 items, its length is a disadvantage. Our purpose was to develop and test a short version of the SS-QoL. Methods Secondary analyses of 3 different studies. We developed the short version using data from 141 patients with aneurysmal subarachnoid haemorrhage (SAH) and tested it on data from independent samples of 97 patients with SAH and 105 patients with ischemic stroke or intracerebral hemorrhage. We selected the item with the highest item-domain correlation from each of the SS-QoL domains to obtain a 12-item SS-QoL (SS-QoL-12) with a total score and physical and psychosocial sub-scores. Criterion validity of the SS-QoL-12 scores was tested in each sample with the original SS-QoL as reference. Results All three scores of the SS-QoL-12 showed good internal consistency (Cronbach's alpha 0.78-0.89). The SS-Qol-12 scores predicted 88-95% of the variance of the original SS-QoL. Mean differences between the SS-QoL-12 and the SS-QoL and their 95% confidence intervals were generally within 0.1 point on a 1-5 scale. The limits of agreement were generally within 0.4 point. Conclusion The SS-QoL-12 has good criterion validity for all subsets of stroke. Because it consists of only 12 questions, this short form will be easy to use in research and clinical settings.
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