Correspondence: Dyspnoea anchoring and methodological considerations in inspiratory capacity based MCID estimation in COPD.

This correspondence letter raises methodological concerns about how dyspnoea anchoring may affect the estimation of the minimal clinically important difference (MCID) when using inspiratory capacity as an outcome measure in patients with COPD. The authors highlight potential biases in study design that could influence MCID calculations, which are used to determine whether treatment changes are clinically meaningful. Accurate MCID thresholds are relevant to physical therapists involved in pulmonary rehabilitation and exercise prescription for COPD populations.

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