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Item response models for the longitudinal analysis of health-related quality of life in cancer clinical trials.

Abstract：

BACKGROUND:The use of health-related quality of life (HRQoL) as an endpoint in cancer clinical trials is growing rapidly. Hence, research into the statistical approaches used to analyze HRQoL data is of major importance, and could lead to a better understanding of the impact of treatments on the everyday life and care of patients. Amongst the models that are used for the longitudinal analysis of HRQoL, we focused on the mixed models from item response theory, to directly analyze raw data from questionnaires. METHODS:We reviewed the different item response models for ordinal responses, using a recent classification of generalized linear models for categorical data. Based on methodological and practical arguments, we then proposed a conceptual selection of these models for the longitudinal analysis of HRQoL in cancer clinical trials. RESULTS:To complete comparison studies already present in the literature, we performed a simulation study based on random part of the mixed models, so to compare the linear mixed model classically used to the selected item response models. As expected, the sensitivity of the item response models to detect random effects with lower variance is better than that of the linear mixed model. We then used a cumulative item response model to perform a longitudinal analysis of HRQoL data from a cancer clinical trial. CONCLUSIONS:Adjacent and cumulative item response models seem particularly suitable for HRQoL analysis. In the specific context of cancer clinical trials and the comparison between two groups of HRQoL data over time, the cumulative model seems to be the most suitable, given that it is able to generate a more complete set of results and gives an intuitive illustration of the data.

journal_name

BMC Med Res Methodol

journal_title

BMC medical research methodology

authors

Barbieri A,Peyhardi J,Conroy T,Gourgou S,Lavergne C,Mollevi C

doi

10.1186/s12874-017-0410-9

subject

Has Abstract

pub_date

2017-09-26 00:00:00

pages

148

issue

1

issn

1471-2288

pii

10.1186/s12874-017-0410-9

journal_volume

17

pub_type

杂志文章,评审

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