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

Table 5 Cross-sectional validity for the fatigue, emotion and mastery domains. Correlations for baseline scores.^†

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)

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

ISSN: 1477-7525