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Table 5 Cross-sectional validity for the fatigue, emotion and mastery 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 Domains CRQ-SA Domains
  Fatigue† Emotion† Mastery† Fatigue† Emotion† Mastery†
Feeling Thermometer 0.10 (-0.07;0.27) 0.08 (-0.09;0.25) 0.17 (0.01;0.33) 0.16 (0.00;0.32) 0.19 (0.03;0.35) 0.30 (0.14;0.46)
SF-36-General Health Perception Index 0.46 (0.31;0.61) 0.28 (0.12;0.44) 0.36 (0.20;0.52) 0.18 (0.01;0.35) 0.12 (-0.05;0.29) 0.38 (0.22;0.54)
SF-36-Physical Functioning Index 0.45 (0.30;0.60) -0.07 (-0.24;0.10) 0.30 (0.14;0.46) 0.21 (0.04;0.38) -0.15 (-0.32;0.02) 0.39 (0.23;0.55)
SF-36-Mental Health Index 0.53 (0.38;0.68) 0.72 (0.60;0.84) 0.62 (0.49;0.75) 0.63 (0.50;0.76) 0.69 (0.57;0.81) 0.42 (0.26;0.58)
SF-36-Vitality Index 0.72 (0.60;0.84) 0.63 (0.50;0.76) 0.67 (0.54;0.80) 0.66 (0.53;0.79) 0.50 (0.35;0.65) 0.49 (0.34;0.64)
Six minutes walk test 0.35§ (0.18;0.52) 0.24 (0.08;0.40) 0.30 (0.14;0.46) 0.00§ (-0.17;0.17) -0.04 (-0.21;0.13) 0.00 (-0.17;0.17)
Borg Scale -0.16 (-0.34;0.02) -0.11 (-0.28;0.06) -0.11 (-0.28;0.08) -0.11 (-0.28;0.06) -0.18 (-0.35;-0.01) -0.31 (-0.47;-0.15)
  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 domains of the CRQ-IA and CRQ-SA