OBJECTIVE: To produce an improved, COPD-specific version of the St. George respiratory questionnaire (SGRQ-C). METHODS: Five different steps were required: (1) Rasch analysis of the responses of 893 COPD patients to the St. George respiratory questionnaire (SGRQ) identified weaker items to be removed; (2) a scoring algorithm was produced using data from 1,036 patients; (3) validity of the new and original SGRQ was tested using data from the original validation study; (4) responsiveness was tested using data from a previously published trial; and (5) a reworded version (SGRQ-C) that no longer specified the recall period was administered to 63 pulmonary rehabilitation participants. RESULTS: Items were removed due to lack of response (n = 1), misfit to the Rasch model (n = 8), and disordered responses (n = 1). Another six items had disordered responses; this was corrected. Scores from the two versions differed slightly, so the scoring algorithm was revised to produce scores equivalent to the original. Intraclass correlation coefficient (ICCC) for the scores for original and new versions was 0.99. Correlations with other measures of disease were very similar to those obtained with the original. New and original scores for treatment effects were similar: difference, 0.1 +/- 2.7 U (+/- SD). Baseline SGRQ and SGRQ-C scores were similar (ICCC, 0.95; 95% confidence interval, 0.92 to 0.97; mean difference, 0.9 +/- 5.8 U). Change scores were similar (difference, 1.0 +/- 7.3 U). CONCLUSIONS: The SGRQ-C contains the best of the original items, no longer specifies a recall period, and produces scores equivalent to the original.
OBJECTIVE: To produce an improved, COPD-specific version of the St. George respiratory questionnaire (SGRQ-C). METHODS: Five different steps were required: (1) Rasch analysis of the responses of 893 COPDpatients to the St. George respiratory questionnaire (SGRQ) identified weaker items to be removed; (2) a scoring algorithm was produced using data from 1,036 patients; (3) validity of the new and original SGRQ was tested using data from the original validation study; (4) responsiveness was tested using data from a previously published trial; and (5) a reworded version (SGRQ-C) that no longer specified the recall period was administered to 63 pulmonary rehabilitation participants. RESULTS: Items were removed due to lack of response (n = 1), misfit to the Rasch model (n = 8), and disordered responses (n = 1). Another six items had disordered responses; this was corrected. Scores from the two versions differed slightly, so the scoring algorithm was revised to produce scores equivalent to the original. Intraclass correlation coefficient (ICCC) for the scores for original and new versions was 0.99. Correlations with other measures of disease were very similar to those obtained with the original. New and original scores for treatment effects were similar: difference, 0.1 +/- 2.7 U (+/- SD). Baseline SGRQ and SGRQ-C scores were similar (ICCC, 0.95; 95% confidence interval, 0.92 to 0.97; mean difference, 0.9 +/- 5.8 U). Change scores were similar (difference, 1.0 +/- 7.3 U). CONCLUSIONS: The SGRQ-C contains the best of the original items, no longer specifies a recall period, and produces scores equivalent to the original.
Authors: David A Kaminsky; Kalpalatha K Guntupalli; Joan Lippmann; Stephanie M Burns; Melissa A Brock; Joan Skelly; Michael DeSarno; Heidi Pecott-Grimm; Ali Mohsin; Catherine LaRock-McMahon; Penney Warren; Martha C Whitney; Nicola A Hanania Journal: J Altern Complement Med Date: 2017-07-17 Impact factor: 2.579
Authors: A Agusti; J J Soler-Cataluña; J Molina; E Morejon; M Garcia-Losa; M Roset; X Badia Journal: Qual Life Res Date: 2015-04-07 Impact factor: 4.147
Authors: Maggie Tabberer; Victoria S Benson; Heather Gelhorn; Hilary Wilson; Niklas Karlsson; Hana Müllerova; Shailendra Menjoge; Stephen I Rennard; Ruth Tal-Singer; Debora Merrill; Paul W Jones Journal: Chronic Obstr Pulm Dis Date: 2017-03-13
Authors: Jeffrey J Swigris; Sandra R Wilson; Kathy E Green; David B Sprunger; Kevin K Brown; Frederick S Wamboldt Journal: Health Qual Life Outcomes Date: 2010-07-31 Impact factor: 3.186
Authors: Paul W Jones; Guy Brusselle; Roberto W Dal Negro; Montse Ferrer; Peter Kardos; Mark L Levy; Thierry Perez; Juan José Soler Cataluña; Thys van der Molen; Lukasz Adamek; Norbert Banik Journal: Prim Care Respir J Date: 2012-09