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

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

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)

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.

ISSN: 1477-7525