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. 2013 Jan 17;143(6):1671–1678. doi: 10.1378/chest.12-0161

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Figure 1. — A, Plot of CDF for the two extreme quartiles of change from baseline in FEV₁ for SGRQ Symptoms domain. B, Plot of CDF for the two extreme quartiles of change from baseline in FEV₁ for SGRQ Activity domain. C, Plot of CDF for the two extreme quartiles of change from baseline in FEV₁ for SGRQ Impacts domain. D, Plot of CDF for the two extreme quartiles of change from baseline in FEV₁ for SGRQ total score. CDF = cumulative distribution function; SGRQ = St. George’s Respiratory Questionnaire.