Dyspnoea-12 | ||||||
Physical | Affective | Total scores | ||||
r, hypothesised | Review mean, range | r, hypothesised | Review mean, range | r, hypothesised | Review mean, range | |
CAT | 0.48 | 0.62 | 0.45 | 0.53 | 0.53 | 0.54 |
(0.3≤r < 0.6) | – | 0.3≤r < 0.6 | – | 0.3≤r < 0.6 | 0.35–0.67 | |
HADS | ||||||
Anxiety | 0.44 | 0.45 | 0.74 | 0.61 | 0.65 | 0.54 |
(0.2≤r <0.5) | 0.33–0.49 | r≥0.6 | 0.54–0.71 | 0.3≤r < 0.6 | 0.35–0.64 | |
Depression | 0.42 | 0.41 | 0.57 | 0.48 | 0.55 | 0.47 |
(0.2≤r <0.5) | 0.22–0.62 | r≥0.6 | 0.24–0.68 | 0.3≤r < 0.6 | 0.22–0.68 | |
mMRC† | 0.36 | 0.55 | 0.28 | 0.41 | 0.36 | 0.41 |
(0.2≤r <0.5) | 0.48–0.64 | r<0.3 | 0.22–0.52 | 0.2≤r <0.5 | 0.39–0.60 | |
Borg CR10 | ||||||
Before 6MWT | 0.17NS | – | 0.13NSr | – | 0.17 NS | – |
(0.2≤r <0.5) | – | r<0.3 | – | 0.2≤r <0.5 | – | |
After 6MWT | 0.26 | – | 0.13NS | – | 0.22 | – |
(0.2≤r <0.5) | – | r<0.3 | – | 0.2≤r <0.5 | – | |
FEV1 predicted‡ | 0.19 | 0.22 | 0.06NS | 0.16 | 0.14 NS | 0.26 |
(0.2≤r <0.5) | 0.06–0.35 | r<0.3 | 0.12–0.23 | 0.2≤r <0.5 | 0.08–0.38 | |
Hospitalisations§ | 0.24 | – | 0.28 | – | 0.29 | – |
(0.2≤r <0.5) | – | r<0.3 | – | 0.2≤r <0.5 | – | |
6MWT distance¶ | 0.32 | 0.35 | 0.26 | 0.22 | 0.33 | 0.35 |
(0.2≤r <0.5) | 0.16–0.52 | r<0.3 | 0.08–0.49 | 0.2≤r <0.5 | 0.13–0.53 |
*Pearson correlations reported in the same direction for ease of interpretation. Statistically significant (p<0.01) unless stated: NS not significant.
†modified Medical Research Council dyspnoea score.
‡Forced expiratory volume in 1 s in percentage of predicted value.
§Number of hospitalisations in the last year.
¶6 min walking test.
CAT, COPD Assessment Test; CR10, Category-Ratio 10; HADS, Hospital Anxiety and Depression Scale; mMRC, modified Medical Research Council.