Estimating loss in quality of life associated with asthma-related crisis events (ESQUARE): a cohort, observational study

Crossman-Barnes, Christina-Jane, Sach, Tracey, Wilson, Andrew and Barton, Garry (2019) Estimating loss in quality of life associated with asthma-related crisis events (ESQUARE): a cohort, observational study. Health and Quality of Life Outcomes, 17 (1), 58. (doi:10.1186/s12955-019-1138-5).

Abstract

BACKGROUND: Evidence of quality of life implications of asthma attacks are limited, particularly when measured on a utility scale, which enables calculating Quality-Adjusted Life-Years (QALYs) and comparisons with other health conditions and services. Therefore, this study sought to estimate the utility loss associated with an asthma-related crisis event (accident and emergency (A&E) attendance or hospital admission).

METHODS: Participants were recruited in a cohort study from A&E and hospital admissions at three UK hospitals. They completed the EuroQol-5 Dimensions 5-Level (EQ-5D-5 L), Asthma Quality of Life Questionnaire (AQLQ), Time trade-off (TTO), and peak flow and symptom diary over 8 weeks, where three different methods (EQ-5D-5 L, AQLQ, and TTO), were used to estimate utilities. The mean difference between two time points were estimated using the Wilcoxon signed rank test.

RESULTS: From baseline to week 8, mean increases (95% CI) were estimated to be 0.086 (0.019-0.153), 0.154 (0.112-0.196) and 0.132 (0.063-0.201) for EQ-5D-5 L, AQL-5D (preference-based measure derived from AQLQ), and TTO respectively over 8 weeks (p < 0.01).

CONCLUSION: Asthma crisis events are estimated to be associated with a mean utility loss of between 0.086 and 0.132. The utility decrement can be used to assign values to asthma-related crisis events, which can enhance economic evaluations.

TRIAL REGISTRATION: NCT02771678 . Registered 13 May 2016.

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Contributors

Author: Tracey Sach

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