TAILIEUCHUNG - báo cáo hóa học:" The visual analog rating scale of health-related quality of life: an examination of end-digit preferences"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài : The visual analog rating scale of health-related quality of life: an examination of end-digit preferences | BioMed Central Health and Quality of Life Outcomes Research Open Access The visual analog rating scale of health-related quality of life an examination of end-digit preferences Amir Shmueli Address Department of Health Management The Hebrew University POB 12272 Jerusalem Israel Email AmirShmueli - ashmueli@ Corresponding author Published 14 November 2005 Received 19 September 2005 - AAf - .-7 1 . A IIOZ U77 7MC - 7 1 Accepted 14 November 2005 Health and Quality of Life Outcomes 2005 3 71 doi 1477-7525-3-71 This article is available from http content 3 1 71 2005 Shmueli licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background The Visual Analog Scale VAS has been extensively used in the valuation of health-related quality of life HRQL . The objective of this paper is to examine the measurement error rounding explanation for the higher prevalence of VAS scores ending with a zero and to provide an alternative interpretation. Methods The analysis is based on more than 4 500 reported VAS valuations of own HRQL included in two Israeli health surveys 1993 and 2000 . Bivariate and logistic regression analyses are used. Results The results show that reporting VAS scores ending with a 0 .-20 .0 10 20. decreases and scores ending with a 5 .-15 -5 5 15 25 . and with any other integer .-12 -1 1 .1 2 . 92 .99 increases as VAS scores depart from 50 particularly when increasing up to 100. This pattern remains after controlling for personal characteristics determining the level of VAS. Discussion Rounding true HRQL to the nearest 10 s or 5 s cannot explain the specific pattern found. It is suggested that this pattern corresponds to a S-shaped value function where individuals tend to evaluate their

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