Figure 3.

Predicted progression of total scores measured in St. George's Respiratory Questionnaire (SGRQ) for the following samples of patients: (A) All patients in the study. (B) Patients without a high risk of perioperative mortality. (C) Patients without high risk for perioperative mortality, and with upper-lobe–predominant emphysema and high exercise capacity. (D) Patients without a high risk for perioperative mortality, upper-lobe–predominant emphysema, and low exercise capacity. (E) Patients without a high risk for perioperative mortality, non–upper-lobe predominant emphysema, and high exercise capacity. (F) Patients without a high risk for perioperative mortality, non–upper-lobe predominant emphysema, and low exercise capacity. Black lines indicate predicted total SGRQ scores for the lung volume reduction surgery (LVRS) treatment group. Gray lines indicate predicted total SGRQ scores for the medical group.