Correlation between St George Respiratory Questionnaire (SGRQ) and both lung function and lung density
| Baseline FEV1 | Baseline Kco | Baseline Perc15 | Baseline RA-950 | |||||
|---|---|---|---|---|---|---|---|---|
| R | p value | R | p value | R | p value | R | p value | |
| *Correlation significant at 0.05 level (two tailed). | ||||||||
| R = Spearman correlation coefficient; Δ = change in 30 months; Perc15 = 15th percentile point; RA-950 = relative area below −950 HU; FEV1 = forced expiratory volume in 1 second; Kco = carbon monoxide transfer coefficient. | ||||||||
| Baseline SGRQ | –0.61* | 0.002 | –0.54* | 0.011 | –0.47* | 0.028 | 0.50* | 0.018 |
| Change in SGRQ | Δ FEV1 | Δ Kco | Δ Perc15 | Δ RA-950 | ||||
| Healthy (n = 6) | –0.20 | 0.70 | 0.23 | 0.65 | –0.41 | 0.42 | 0.06 | 0.91 |
| Emphysema (n = 16) | –0.22 | 0.42 | –0.26 | 0.34 | –0.74* | 0.001 | 0.67* | 0.004 |
| Total group (n = 22) | –0.28 | 0.21 | –0.18 | 0.44 | –0.56* | 0.007 | 0.60* | 0.003 |