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The COPD assessment test and St George's Respiratory Questionnaire: are they equivalent in subjects with COPD?

Morishita-Katsu M, Nishimura K, Taniguchi H, Kimura T, Kondoh Y, Kataoka K, Ogawa T, Watanabe F, Arizono S, Nishiyama O, Nakayasu K, Imaizumi K, Hasegawa Y - Int J Chron Obstruct Pulmon Dis (2016)

Bottom Line: Statistically significant correlations were observed between CAT and SGRQ total scores (R=0.668, P<0.001).The CAT is similar to SGRQ in terms of discriminating health status.However, we demonstrated that what is assessed by the CAT may differ slightly from what is measured by SGRQ.

View Article: PubMed Central - PubMed

Affiliation: Department of Respiratory Medicine and Allergy, Tosei General Hospital, Seto, Japan; Division of Respiratory Medicine, Department of Medicine, Nagoya University Graduate School of Medicine, Nagoya, Japan.

ABSTRACT

Background: The chronic obstructive pulmonary disease (COPD) assessment test (CAT) is a short questionnaire that has facilitated health status measurements in subjects with COPD. However, it remains controversial as to whether the CAT can be used as a suitable substitute for the St George's Respiratory Questionnaire (SGRQ). This study investigated the reliability and score distributions of the CAT and SGRQ and evaluated which factors contributed to health status for each questionnaire.

Methods: A total of 109 consecutive subjects with stable COPD from a single center were enrolled in this study. Each subject completed pulmonary function tests, exercise tests, and the following self-administered questionnaires: the Baseline Dyspnea Index, the Hospital Anxiety and Depression Scale, the CAT, and SGRQ.

Results: Internal consistencies of CAT and SGRQ total scores were both excellent (Cronbach's α coefficients =0.890 and 0.933). Statistically significant correlations were observed between CAT and SGRQ total scores (R=0.668, P<0.001). Correlations of CAT scores with parameters related to pulmonary function, dyspnea, exercise performance, and psychological factors were inferior to correlations with those parameters with SGRQ total scores. Both multiple regression analyses and principal component analyses revealed that there were slight differences between SGRQ total scores and CAT scores.

Conclusion: The CAT is similar to SGRQ in terms of discriminating health status. However, we demonstrated that what is assessed by the CAT may differ slightly from what is measured by SGRQ.

No MeSH data available.


Related in: MedlinePlus

Frequency distribution histograms and cumulative frequency distribution curves of CAT (A) and SGRQ (B) total scores in 109 consecutive subjects with stable COPD.Notes: The bars show the frequency distribution for each score. Line plots indicate the cumulative percentage of patients.Abbreviations: CAT, COPD assessment test; COPD, chronic obstructive pulmonary disease; SGRQ, St George’s Respiratory Questionnaire.
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f1-copd-11-1543: Frequency distribution histograms and cumulative frequency distribution curves of CAT (A) and SGRQ (B) total scores in 109 consecutive subjects with stable COPD.Notes: The bars show the frequency distribution for each score. Line plots indicate the cumulative percentage of patients.Abbreviations: CAT, COPD assessment test; COPD, chronic obstructive pulmonary disease; SGRQ, St George’s Respiratory Questionnaire.

Mentions: The score distribution and internal consistency assessed with Cronbach’s α coefficient for CAT and SGRQ scores in this study are listed in Table 2. The internal consistency of the CAT was high (Cronbach’s α coefficient =0.890), and the coefficient for SGRQ was also high (α =0.933). Floor and ceiling effects were not seen. Figure 1 shows frequency distribution histograms and cumulative frequency distribution curves of CAT and SGRQ total scores.


The COPD assessment test and St George's Respiratory Questionnaire: are they equivalent in subjects with COPD?

Morishita-Katsu M, Nishimura K, Taniguchi H, Kimura T, Kondoh Y, Kataoka K, Ogawa T, Watanabe F, Arizono S, Nishiyama O, Nakayasu K, Imaizumi K, Hasegawa Y - Int J Chron Obstruct Pulmon Dis (2016)

Frequency distribution histograms and cumulative frequency distribution curves of CAT (A) and SGRQ (B) total scores in 109 consecutive subjects with stable COPD.Notes: The bars show the frequency distribution for each score. Line plots indicate the cumulative percentage of patients.Abbreviations: CAT, COPD assessment test; COPD, chronic obstructive pulmonary disease; SGRQ, St George’s Respiratory Questionnaire.
© Copyright Policy
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4940016&req=5

f1-copd-11-1543: Frequency distribution histograms and cumulative frequency distribution curves of CAT (A) and SGRQ (B) total scores in 109 consecutive subjects with stable COPD.Notes: The bars show the frequency distribution for each score. Line plots indicate the cumulative percentage of patients.Abbreviations: CAT, COPD assessment test; COPD, chronic obstructive pulmonary disease; SGRQ, St George’s Respiratory Questionnaire.
Mentions: The score distribution and internal consistency assessed with Cronbach’s α coefficient for CAT and SGRQ scores in this study are listed in Table 2. The internal consistency of the CAT was high (Cronbach’s α coefficient =0.890), and the coefficient for SGRQ was also high (α =0.933). Floor and ceiling effects were not seen. Figure 1 shows frequency distribution histograms and cumulative frequency distribution curves of CAT and SGRQ total scores.

Bottom Line: Statistically significant correlations were observed between CAT and SGRQ total scores (R=0.668, P<0.001).The CAT is similar to SGRQ in terms of discriminating health status.However, we demonstrated that what is assessed by the CAT may differ slightly from what is measured by SGRQ.

View Article: PubMed Central - PubMed

Affiliation: Department of Respiratory Medicine and Allergy, Tosei General Hospital, Seto, Japan; Division of Respiratory Medicine, Department of Medicine, Nagoya University Graduate School of Medicine, Nagoya, Japan.

ABSTRACT

Background: The chronic obstructive pulmonary disease (COPD) assessment test (CAT) is a short questionnaire that has facilitated health status measurements in subjects with COPD. However, it remains controversial as to whether the CAT can be used as a suitable substitute for the St George's Respiratory Questionnaire (SGRQ). This study investigated the reliability and score distributions of the CAT and SGRQ and evaluated which factors contributed to health status for each questionnaire.

Methods: A total of 109 consecutive subjects with stable COPD from a single center were enrolled in this study. Each subject completed pulmonary function tests, exercise tests, and the following self-administered questionnaires: the Baseline Dyspnea Index, the Hospital Anxiety and Depression Scale, the CAT, and SGRQ.

Results: Internal consistencies of CAT and SGRQ total scores were both excellent (Cronbach's α coefficients =0.890 and 0.933). Statistically significant correlations were observed between CAT and SGRQ total scores (R=0.668, P<0.001). Correlations of CAT scores with parameters related to pulmonary function, dyspnea, exercise performance, and psychological factors were inferior to correlations with those parameters with SGRQ total scores. Both multiple regression analyses and principal component analyses revealed that there were slight differences between SGRQ total scores and CAT scores.

Conclusion: The CAT is similar to SGRQ in terms of discriminating health status. However, we demonstrated that what is assessed by the CAT may differ slightly from what is measured by SGRQ.

No MeSH data available.


Related in: MedlinePlus