Reliability and validity of the chronic respiratory questionnaire (CRQ).

Wijkstra, Peter J.; TenVergert, Elisabeth M.; Altena, Richard van; Otten, V; Postma, Dirkje S.; Kraan, Jan; Koëter, Gerard H.

doi:10.1136/thx.49.5.465

Cited by 191 publications

(122 citation statements)

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“…The questionnaire reliability compares favourably with those of previous studies of the original English CRQ (7,24) and SGRQ (8,25). However, the dimension symptoms subscale of the SGRQ did not do as well.…”

Section: Discussionsupporting

confidence: 68%

French‐Canadian Version of the Chronic Respiratory and of the St George′s Respiratory Questionnaires: An Assessment of their Psychometric Properties in Patients with Chronic Obstructive Pulmonary Disease

Bourbeau

Maltais

Rouleau

et al. 2004

Canadian Respiratory Journal

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BACKGROUND: French versions of the Chronic Respiratory Questionnaire (CRQ) and the St George's Respiratory Questionnaire (SGRQ) have largely been used in Canada, although the process by which they were translated remains unknown and the psychometric properties of these translated versions have not been assessed in a properly designed study. OBJECTIVE: To translate and evaluate the psychometric properties of the French-Canadian versions of the CRQ and the SGRQ. METHODS: The questionnaires were translated according to standardized guidelines for cross-cultural adaptation. Measurements were made at baseline and again after two weeks in 27 chronic obstructive pulomonary disease (COPD) patients known to have stable disease. Measurements were also taken pre-and post-treatment in patients with acute exacerbation of COPD (33 patients) or in pulmonary rehabilitation (32 patients). RESULTS:The CRQ showed high test-retest reliability (the majority above 0.70), although it was slightly lower for the dyspnea dimension (0.58 to 0.65). The SGRQ also showed high test-retest reliability (above 0.80), although it was lower for the symptoms dimension (0.54 to 0.58). The internal consistency reliability coefficients ranged from 0.73 to 0.90 for the CRQ and above 0.80 for the SGRQ, except for the symptoms dimension. The Pearson's correlation coefficients were low (less than 0.30) between most of the translated questionnaire dimension scores and forced expiratory volume in 1 s, 6 min walking test and dyspnea measures. The correlation was generally high (greater than 0.50) between the two questionnaires and the 36-item short form health survey, and for those domains that measured the same construct. The changes in the total and subscale scores of the CRQ and the SGRQ (except for the symptoms domain) were all largely above the variability of the score in the stable disease group. CONCLUSION: The present study confirms that the FrenchCanadian translated versions of the CRQ and the SGRQ perform well with respect to their psychometric properties. They are both suitable for their intended purpose, ie, to detect change in health status in patients with COPD when assessing if a treatment is beneficial. However, the symptoms domain of the SGRQ cannot be used to assess acute change with respect to a given therapy. RÉSULTATS : Le CRQ a montré une bonne fiabilité de test-retest (audessus de 0,70 dans la plupart des cas), même si celle-ci était légèrement inférieure (0,58-0,65) à l'égard de la dyspnée. Le SGRQ a aussi montré une bonne fiabilité de test-retest (au-dessus de 0,80), même si celle-ci était légèrement inférieure (0,54-0,58) à l'égard des symptômes. Les coefficients de cohérence interne variaient entre 0,73 et 0,90 pour le CRQ et ils se tenaient au-dessus de 0,80 pour le SGRQ, sauf en ce qui concerne les symptômes. Les coefficients de corrélation de Bravais-Pearson étaient faibles (inférieurs à 0,30) entre la plupart des résultats des différents aspects dans les questionnaires traduits et le volume expiratoire maximal par seconde, l'ép...

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Section: Discussionsupporting

confidence: 68%

French‐Canadian Version of the Chronic Respiratory and of the St George′s Respiratory Questionnaires: An Assessment of their Psychometric Properties in Patients with Chronic Obstructive Pulmonary Disease

Bourbeau

Maltais

Rouleau

et al. 2004

Canadian Respiratory Journal

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“…For both dyspnea and fatigue, higher scores indicate less severe symptoms. Extensive data on reliability and validity of the CRQ have been published (Guyatt, King, Feeny, Stubbing, & Goldstein, 1999;Wijkstra et al, 1994).…”

Section: Measurementsmentioning

confidence: 99%

Associations between symptoms, functioning, and perceptions of mastery with global self-rated health in patients with COPD: A cross-sectional study

Nguyen

Donesky

Carrieri‐Kohlman

2008

International Journal of Nursing Studies

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“…Most widely used questionnaires have quite good internal consistency, as again reported in the two papers in this issue of the Journal [1,2]. There have been occasional reports of low consistency [4], but such occurrences appear to be rare.…”

mentioning

confidence: 68%

Testing health status (“quality of life”) questionnaires for asthma and COPD

Pw¹

1998

Eur Respir J

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Two papers in this issue of the Journal address the problem of testing versions of health status (or "quality of life") questionnaires after translation from their original English [1,2]. Tests of the validity of health questionnaires fall into four main areas: internal consistency; discriminative properties, i.e. the ability to distinguish different levels of disease between patients; evaluative properties, i.e. the ability to detect clinically meaningful changes in health; and predictive validity, i.e. the ability to predict future changes in health or healthcare needs. It is clear from this list that the process of validation is long and complex. Indeed, it is never-ending. Each new study in which a health questionnaire is used contributes to the body of knowledge concerning its performance, and thereby to its validity.A further term used in this general context is "reliability". This is a measure of the likelihood that an instrument will give the same reading when used to measure the same thing in a different setting. This is usually tested in terms of repeatability, which is dependent on the assumption that the patients' health will not have changed between assessments. The usual approach is to recruit stable patients and make the assessments within 1-2 weeks. Some workers confine their measurements to those patients who report no overall change in their symptoms or health, as assessed by a global measure of change. At first sight this seems reasonable, but it presupposes that the patients' recall is accurate and that their estimates of change are reliable. Other tests of reliability are less frequently reported, but a recent study has examined broader aspects of the reliability of a disease-specific questionnaire, and found that it behaved similarly in a face-to-face interview compared with subsequent computer-assisted telephone interviews [3].Tests of internal consistency are usually made at the time of questionnaire development, and most questionnaire developers use methods that either directly or indirectly examine issues of internal consistency. Such tests were developed to address the problem that arose when attempts were made to develop questionnaires designed to test abstract concepts, such as anxiety or depression, for which there were no adequate reference instruments at the time, apart from clinical judgement. More recently, greater attention has been paid to tests of discriminant and evaluative properties than to internal consistency. Most widely used questionnaires have quite good internal consistency, as again reported in the two papers in this issue of the Journal [1, 2]. There have been occasional reports of low consistency [4], but such occurrences appear to be rare.The simplest way to test the discriminative properties of a new questionnaire is to compare it with another established health status instrument in the same population of patients. Unfortunately, this does not prove that the new questionnaire is measuring health, merely that the two questionnaires appear to be addressing similar...

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Reliability and validity of the chronic respiratory questionnaire (CRQ).

Cited by 191 publications

References 10 publications

French‐Canadian Version of the Chronic Respiratory and of the St George′s Respiratory Questionnaires: An Assessment of their Psychometric Properties in Patients with Chronic Obstructive Pulmonary Disease

French‐Canadian Version of the Chronic Respiratory and of the St George′s Respiratory Questionnaires: An Assessment of their Psychometric Properties in Patients with Chronic Obstructive Pulmonary Disease

Associations between symptoms, functioning, and perceptions of mastery with global self-rated health in patients with COPD: A cross-sectional study

Testing health status (“quality of life”) questionnaires for asthma and COPD

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