Table 5.

Correlations* (hypotheses) and review findings⁹ for Dyspnoea-12 scores, patient-reported data and clinical measures (n=203)

	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.