1. Minimum clinically important difference for the COPD Assessment Test: a prospective analysis 
Dr Samantha S C Kon, MBBS, Jane L Canavan, PhD, Sarah E Jones, MSc, Claire M Nolan, BSc, Amy L Clark, BSc, Mandy J Dickson, RGN, Brigitte M Haselden, PhD, Prof Michael I Polkey, PhD, William D-C Man, PhD 
The Lancet Respiratory Medicine 
Volume 2, Issue 3, Pages (March 2014)
DOI: /S (14)
Copyright © 2014 Elsevier Ltd Terms and Conditions

2. Figure 1
Association between change in CAT score and change in (A) SGRQ score and (B) CRQ score with pulmonary rehabilitation (Study 1)
CAT=COPD Assessment Test. SGRQ=St George's Respiratory Questionnaire. CRQ=Chronic Respiratory Questionnaire.
The Lancet Respiratory Medicine 2014 2, DOI: ( /S (14) )
Copyright © 2014 Elsevier Ltd Terms and Conditions

3. Figure 2
Receiver operator characteristic curves using a change in COPD Assessment Test score of −2 to best predict achievement of minimum clinically important improvement in (A) SGRQ score and (B) CRQ score (Study 1)
ΔSGRQ=change in St George's Respiratory Questionnaire score. ΔCRQ=change in Chronic Respiratory Questionnaire score. AUC=area under the curve C statistic.
The Lancet Respiratory Medicine 2014 2, DOI: ( /S (14) )
Copyright © 2014 Elsevier Ltd Terms and Conditions

4. Figure 3
Association between CAT score and change in SGRQ score at hospital discharge for acute exacerbation of COPD to 90 days after discharge (Study 2)
CAT=COPD Assessment Test. SGRQ=St George's Respiratory Questionnaire.
The Lancet Respiratory Medicine 2014 2, DOI: ( /S (14) )
Copyright © 2014 Elsevier Ltd Terms and Conditions

5. Figure 4
Association between change in CAT score and change in SGRQ score over 12 months in stable patients with COPD (Study 3)
CAT=COPD Assessment Test. SGRQ=St George's Respiratory Questionnaire.
The Lancet Respiratory Medicine 2014 2, DOI: ( /S (14) )
Copyright © 2014 Elsevier Ltd Terms and Conditions