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Health and Quality of Life Outcomes
Published in: Health and Quality of Life Outcomes 1/2014

Open Access 01-12-2014 | Research

Mapping of Incontinence Quality of Life (I-QOL) scores to Assessment of Quality of Life 8D (AQoL-8D) utilities in patients with idiopathic overactive bladder

Authors: Gang Chen, Jonathan T Tan, Kwong Ng, Angelo Iezzi, Jeffrey Richardson

Published in: Health and Quality of Life Outcomes | Issue 1/2014

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Abstract

Background

The Incontinence Quality of Life (I-QOL) questionnaire is a commonly used and validated incontinence specific QOL instrument. The objective of this study is to develop an algorithm to map I-QOL to the Assessment of Quality of Life (AQoL) 8D utility instrument in patients with idiopathic overactive bladder (iOAB).

Methods

I-QOL and AQoL-8D scores were collected in a survey of 177 Australian adults with urinary incontinence due to iOAB. Three statistical methods were used for estimation, namely ordinary least squares (OLS) regression, the robust MM-estimator, and the generalised linear models (GLM). Each included a range of explanatory variables. Model performance was assessed using key goodness-of-fit measures in the validation dataset.

Results

The I-QOL total score and AQoL-8D utility scores were positively correlated (r = 0.50, p < 0.0001). Similarly, the three sub-scales of the I-QOL were correlated with the eight dimensions and two super-dimensions of the AQoL-8D. The GLM estimator, with I-QOL total score as the explanatory variable exhibited the best precision (MAE = 0.15 and RMSE = 0.18) with a mapping function given by AQoL-8D = exp(–1.28666 + 1.011072*I-QOL/100).

Conclusions

The mapping algorithm developed in this study allows the derivation of AQoL-8D utilities from I-QOL scores. The algorithm allows the calculation of preference-based QOL scores for use in cost-utility analyses to assess the impact of interventions in urinary incontinence.
Appendix
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Metadata
Title
Mapping of Incontinence Quality of Life (I-QOL) scores to Assessment of Quality of Life 8D (AQoL-8D) utilities in patients with idiopathic overactive bladder
Authors
Gang Chen
Jonathan T Tan
Kwong Ng
Angelo Iezzi
Jeffrey Richardson
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Health and Quality of Life Outcomes / Issue 1/2014
Electronic ISSN: 1477-7525
DOI
https://doi.org/10.1186/s12955-014-0133-0

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