PT  - JOURNAL ARTICLE
AU  - Rachael A Evans
AU  - Sally J Singh
TI  - Minimum important difference of the incremental shuttle walk test distance in patients with COPD
AID  - 10.1136/thoraxjnl-2018-212725
DP  - 2019 May 30
TA  - Thorax
PG  - thoraxjnl-2018-212725
4099  - http://thorax.bmj.com/content/early/2019/05/30/thoraxjnl-2018-212725.short
4100  - http://thorax.bmj.com/content/early/2019/05/30/thoraxjnl-2018-212725.full
AB  - We aimed to describe the minimum important difference (MID) of the incremental shuttle walk test (ISWT) in patients with COPD using both distribution and anchor-based methods. Two cohorts were used (n=613) with eligibility criteria of a clinical diagnosis of COPD, an FEV1/FVC <70% and an ISWT (after familiarisation) before and after a 7-week course of pulmonary rehabilitation (PR). The MID of the ISWT using the distribution method was 36.1 m. The area under the curve to discriminate between perceived ‘improvement’ and ‘no improvement’ after PR for a change in ISWT of 35 m was 0.66 (0.58–0.73). The MID of the ISWT is therefore between 35.0 and 36.1 m.