Identifying and appraising outcome measures for severe asthma: a systematic review.

Background: Valid outcome measures are imperative to evaluate treatment response, yet the suitability of existing end-points for severe asthma is unclear. This review aimed to identify outcome measures for severe asthma and appraise the quality of their measurement properties.

Methods: A literature search was performed to identify "candidate" outcome measures published between 2018 and 2020.