Authors: Christine M McDonough Margaret R Grove Tor D Tosteson Jon D Lurie Alan S Hilibrand Anna N A Tosteson
Publish Date: 2005/06/01
Volume: 14, Issue: 5, Pages: 1321-1332
Abstract
Purpose To compare societal values across healthstate classification systems and to describe the performance of these systems at baseline in a large population of persons with confirmed diagnosis of intervertebral disc herniation IDH spinal stenosis SpS or degenerative spondylolisthesis DS Methods We compared values for EQ5D York weights HUI Mark 2 and 3 SF6D and the SF36derived estimate of the Quality of Well Being eQWB score using signed rank tests We tested each instrument’s ability to discriminate between health categories and level of symptom satisfaction Correlations were assessed with Spearman rank correlations We evaluated ceiling and floor effects by comparing the proportion at the highest and the lowest possible score for each tool In addition we compared proportions at the highest and lowest levels by dimension The number of unique health states assigned was compared across instruments We calculated the difference between those who were very dissatisfied and all others Results Mean values ranged from 039 to 063 among 2097 participants ages 18–93 mean age 53 47 female with significant differences in pairwise comparisons noted for all systems Correlations ranged from 030 to 078 Although all systems showed statistically significant differences in health state values when baseline comparisons were made between those who were very dissatisfied with their symptoms and those who were not the magnitude of this difference ranged widely across systems Mean differences 95 CI between those very dissatisfied and all others were 030 0269 0329 for EQ5D 022 0190 0241 for HUI3 018 0161 0201 for HUI2 011 0095 0117 for SF6D 004 0039 0049 for eQWB and 007 0056 0077 for VAS with transformation applied to group means Conclusion Differences in preferenceweighted health state classification systems are evident at baseline in a population with confirmed IDH SpS and DS Caution should be used when comparing health state values derived from various systems
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