Table 2.

Reproducibility by test-retest of VSRQ and SGRQ between screening (V1) and baseline visits (V2), ie, two weeks, in stable patients (N = 535)

Questionnaires	N	Mean change in scores (SD)	ICC	CCC	p-value sign rank test
VSRQ global scorea	455	0.32 (11.1)	0.77	0.77	0.45
SGRQ total scorea	515	0.37 (9.30)	0.86	0.86	0.27

^aNotes: 80 missing data for VSRQ; 20 missing data for SGRQ.

Abbreviations: CCC, concordance correlation coefficient; ICC, intraclass correlation coefficient; SD, standard deviation; SGRQ, St George’s Respiratory Questionnaire; VSRQ, Visual Simplified Respiratory Questionnaire.