A Rasch model analysis of two interpretations of 'not relevant' responses on the Dermatology Life Quality Index (DLQI)

Rencz Fanni; Mitev Ariel Z.; Szabo AkosBeretzky ZsuzsannaPoor Adrienn K.Hollo PeterWikonkal NorbertSardy MiklosKarpati SaroltaSzegedi AndreaRemenyik EvaBrodszky Valentin

首页> 外文期刊>Quality of life research: An international journal of quality of life aspects of treatment, care and rehabilitation >A Rasch model analysis of two interpretations of 'not relevant' responses on the Dermatology Life Quality Index (DLQI)

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A Rasch model analysis of two interpretations of 'not relevant' responses on the Dermatology Life Quality Index (DLQI)

机译：A Rasch model analysis of two interpretations of 'not relevant' responses on the Dermatology Life Quality Index (DLQI)

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Purpose Eight of the ten items of the Dermatology Life Quality Index (DLQI) have a 'not relevant' response (NRR) option. There are two possible ways to interpret NRRs: they may be considered 'not at all' or missing responses. We aim to compare the measurement performance of the DLQI in psoriasis patients when NRRs are scored as '0' (hereafter zero-scoring) and 'missing' (hereafter missing-scoring) using Rasch model analysis. Methods Data of 425 patients with psoriasis from two earlier cross-sectional surveys were re-analysed. All patients completed the paper-based Hungarian version of the DLQI. A partial credit model was applied. The following model assumptions and measurement properties were tested: dimensionality, item fit, person reliability, order of response options and differential item functioning (DIF). Results Principal component analysis of the residuals of the Rasch model confirmed the unidimensional structure of the DLQI. Person separation reliability indices were similar with zero-scoring (0.910) and missing-scoring (0.914) NRRs. With zero-scoring, items 6 (sport), 7 (working/studying) and 9 (sexual difficulties) suffered from item misfit and item-level disordering. With missing-scoring, no misfit was observed and only item 7 was illogically ordered. Six and three items showed DIF for gender and age, respectively, that were reduced to four and three by missing-scoring. Conclusions Missing-scoring NRRs resulted in an improved measurement performance of the scale. DLQI scores of patients with at least one vs. no NRRs cannot be directly compared. Our findings provide further empirical support to the DLQI-R scoring modification that treats NRRs as missing and replaces them with the average score of the relevant items.

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《Quality of life research: An international journal of quality of life aspects of treatment, care and rehabilitation》 |2021年第8期|2375-2386|共12页
作者
Rencz Fanni; Mitev Ariel Z.; Szabo AkosBeretzky ZsuzsannaPoor Adrienn K.Hollo PeterWikonkal NorbertSardy MiklosKarpati SaroltaSzegedi AndreaRemenyik EvaBrodszky Valentin;
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作者单位

Semmelwe Univ, Fac Med, Dept Dermatol Venereol & Dermatooncol, 41 Maria U, H-1085 Budapest, Hungary;

Univ Debrecen, Fac Med, Dept Dermatol, 98 Nagyerde Krt, H-4032 Debrecen, Debrecen, Hungary;

Corvinus Univ Budapest, Dept Hlth Econ, 8 Fovam Ter, H-1093 Budapest, HungaryCorvinus Univ Budapest, Inst Mkt, 8 Fovam Ter, H-1093 Budapest, Hungary;

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原文格式 PDF
正文语种英语
中图分类医药、卫生;
关键词
Psoriasis; Dermatology Life Quality Index; Psychometrics; Rasch model; 8216; not relevant; 8217; response; DLQI-R;

A Rasch model analysis of two interpretations of 'not relevant' responses on the Dermatology Life Quality Index (DLQI)

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