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Table 3 Spearman correlation coefficients among PRO measures and 6MWD

From: The 6-minute walk test predicts mortality in a pulmonary nontuberculous mycobacteria-predominant bronchiectasis cohort

  SGRQ Total Score 6MWD MRC Dyspnea Scale
6MWD − 0.53* NA NA
MRC Dyspnea Scale 0.6* − 0.35* NA
PSSS-severity 0.76* − 0.46* 0.45*
PSSS-frequency 0.76* − 0.4* 0.45*
  1. 6MWD 6-minute walk distance, MRC Medical Research Council, SGRQ St. George’s Respiratory Questionnaire, PSSS Pulmonary Symptom Severity Score (contains two components -severity and -frequency)
  2. *Significant at p < 0.001