St George’s Respiratory Questionnaire (SGRQ) and computed tomography (CT) volume comparisons using all 40 subjects with 3- or 6-month paired CT data
| CT responder | CT nonresponder | |
| SGRQ responder | 14 (35) | 7 (18) |
| SGRQ nonresponder | 4 (10) | 15 (38) |
Data are presented as n (%). Correlation is significant at p<0.01 using Chi-squared testing with continuity correction.