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Table 4 Cross-sectional validity for the individualised and standardised dyspnoea domains: Correlations for baseline scores.

From: Self-administration and interviewer-administration of the German Chronic Respiratory Questionnaire: instrument development and assessment of validity and reliability in two randomised studies

Instrument and domain CRQ-IA Dyspnoea Domains CRQ-SA Dyspnoea Domains
  Individualised† Standardised† Individualised† Standardised†
Feeling Thermometer 0.04 (-0.13;0.21) 0.12§ (-0.05;0.29) 0.09* (-0.08;0.26) 0.58* § (0.44;0.72)
SF-36-General Health Perception Index 0.03 (-0.14;0.20) 0.18 (0.01;0.35) 0.28 (0.12;0.44) 0.35 (0.19;0.51)
SF-36-Physical Functioning Index 0.42 (0.26;0.58) 0.54 (0.40;0.68) 0.34* (0.18;0.50) 0.68* (0.55;0.81)
Mental Health Index 0.04 (-0.13;0.21) 0.20§ (0.03;0.37) 0.35 (0.19;0.51) 0.54§ (0.40;0.68)
SF-36-Vitality Index 0.17* § (0.00;0.34) 0.59* (0.45;0.73) 0.60§ (0.46;0.74) 0.50 (0.35;0.65)
Six minutes walk test 0.25 (0.08;0.42) 0.30 (0.14;0.46) 0.10 (-0.07;0.27) 0.28 (0.12;0.44)
Borg Scale -0.17 (-0.35;0.01) -0.03 (-0.20;0.14) -0.28 (-0.44;-0.12) -0.34 (-0.50;-0.18)
  1. CRQ-IA = Interviewer administered German Chronic Respiratory Questionnaire. CRQ-SA = Self-administered German Chronic Respiratory Questionnaire. † Pearson Correlation Coefficient (95% confidence intervals); r > 0.28 significant at p < 0.05. * indicate significant differences between the individualised and standardised dyspnoea domains §indicate significant differences between the domains of the CRQ-IA and CRQ-SA.