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.

Puhan et al. Health and Quality of Life Outcomes 2004 2:1   doi:10.1186/1477-7525-2-1

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