The minimal important difference for St. George’s Respiratory Questionnaire in patients with severe COPD

Jorrit Welling
What is the minimal important difference for SGRQ in patients with severe COPD?
We hypothesize that the currently accepted MID for the SGRQ will not stand and will prove to be larger than 4 SGRQ units.
This data repository is not currently reporting usage information. For information on how your repository can submit usage information, please see our documentation.