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. 1994 May;49(5):465–467. doi: 10.1136/thx.49.5.465

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

P J Wijkstra 1, E M TenVergert 1, R Van Altena 1, V Otten 1, D S Postma 1, J Kraan 1, G H Koëter 1
PMCID: PMC474867  PMID: 8016767

Abstract

BACKGROUND--The Chronic Respiratory Questionnaire (CRQ) is frequently applied to assess quality of life in patients with chronic obstructive pulmonary disease (COPD). However, the reliability and validity of this questionnaire have not yet been determined. This study investigates the reliability and validity of the four separate dimensions of the CRQ. METHODS--The CRQ was administered on two consecutive days to 40 patients with COPD (mean FEV1 44% predicted, FEV1/IVC 37% predicted). Internal consistency reliability of each dimension was investigated by Cronbach's alpha reliability coefficient, test retest reliability by the Spearman-Brown reliability coefficient (p), and content validity by Pearson's correlation coefficient between the CRQ and the symptom checklist (SCL-90). RESULTS--Items of the fatigue, emotion, and mastery dimensions showed a high internal consistency reliability (alpha = 0.71-0.88) as well as a high test retest reliability (p above 0.90). These three dimensions correlated with comparable dimensions of the SCL-90. Items of the dyspnoea dimension showed a low internal consistency reliability (alpha = 0.53) and a test retest reliability of p = 0.73. CONCLUSIONS--Items of the dimensions fatigue, emotion, and mastery of the CRQ are reliable and valid and can be used to assess quality of life in patients with severe airways obstruction. Items of the dyspnoea dimension are less reliable and should not be included in the overall score of the CRQ in comparative research. However, by scoring the items of dyspnoea separately they may be useful for the evaluation of the effects of intervention in a specific patient.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Bergner M., Bobbitt R. A., Carter W. B., Gilson B. S. The Sickness Impact Profile: development and final revision of a health status measure. Med Care. 1981 Aug;19(8):787–805. doi: 10.1097/00005650-198108000-00001. [DOI] [PubMed] [Google Scholar]
  2. Guyatt G. H., Berman L. B., Townsend M., Pugsley S. O., Chambers L. W. A measure of quality of life for clinical trials in chronic lung disease. Thorax. 1987 Oct;42(10):773–778. doi: 10.1136/thx.42.10.773. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Guyatt G. Measuring health status in chronic airflow limitation. Eur Respir J. 1988 Jun;1(6):560–564. [PubMed] [Google Scholar]
  4. Hays R. D., Hadorn D. Responsiveness to change: an aspect of validity, not a separate dimension. Qual Life Res. 1992 Feb;1(1):73–75. doi: 10.1007/BF00435438. [DOI] [PubMed] [Google Scholar]
  5. Jones P. W., Quirk F. H., Baveystock C. M., Littlejohns P. A self-complete measure of health status for chronic airflow limitation. The St. George's Respiratory Questionnaire. Am Rev Respir Dis. 1992 Jun;145(6):1321–1327. doi: 10.1164/ajrccm/145.6.1321. [DOI] [PubMed] [Google Scholar]
  6. Kaplan R. M., Atkins C. J., Timms R. Validity of a quality of well-being scale as an outcome measure in chronic obstructive pulmonary disease. J Chronic Dis. 1984;37(2):85–95. doi: 10.1016/0021-9681(84)90050-x. [DOI] [PubMed] [Google Scholar]
  7. McSweeny A. J., Grant I., Heaton R. K., Adams K. M., Timms R. M. Life quality of patients with chronic obstructive pulmonary disease. Arch Intern Med. 1982 Mar;142(3):473–478. [PubMed] [Google Scholar]
  8. Prigatano G. P., Wright E. C., Levin D. Quality of life and its predictors in patients with mild hypoxemia and chronic obstructive pulmonary disease. Arch Intern Med. 1984 Aug;144(8):1613–1619. [PubMed] [Google Scholar]
  9. Schrier A. C., Dekker F. W., Kaptein A. A., Dijkman J. H. Quality of life in elderly patients with chronic nonspecific lung disease seen in family practice. Chest. 1990 Oct;98(4):894–899. doi: 10.1378/chest.98.4.894. [DOI] [PubMed] [Google Scholar]
  10. Traver G. A. Measures of symptoms and life quality to predict emergent use of institutional health care resources in chronic obstructive airways disease. Heart Lung. 1988 Nov;17(6 Pt 1):689–697. [PubMed] [Google Scholar]

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