TABLE 4.

Spearman's correlation coefficients between D‐12‐C and 6MWD, MRC Dyspnoea Scale, BODE Index, SGRQ, SF36, CAT and HADS

Scale/Sub‐score	D‐12‐C total	D‐12‐C physical	D‐12‐C affective
6MWD	−0.17*	−0.22**	−0.02
MRC Dyspnoea Scale	0.22**	0.25**	0.11
BODE index	0.22**	0.25**	0.07
SGRQ total	0.59**	0.57**	0.44**
SGRQ symptoms	0.26**	0.28**	0.17
SGRQ activity	0.35**	0.38**	0.16
SGRQ impact	0.29**	0.26**	0.22*
SF‐36 total	−0.31**	−0.28**	−0.27**
SF‐36 mental heath	−0.34**	−0.28**	−0.36**
SF‐36 physical health	−0.24**	−0.22*	−0.168
CAT	0.56**	0.56**	0.41**
HADS total	0.46**	0.41**	0.51**
HADS anxiety	0.45**	0.38**	0.51**
HADS depression	0.41**	0.37**	0.44**

Abbreviations: 6MWD, Six‐Minute Walking Distance; BODE Index, Body‐Mass Index, Airflow Obstruction, Dyspnea, and Exercise Capacity (BODE) Index; CAT, COPD Assessment Test; D‐12‐C, Chinese version of Dyspnoea‐12; HADS, Hospital Anxiety and Depression Scale; MRC Dyspnoea Scale, Medical Research Council Dysnoea Scale; SF‐36, 36‐Item Short Form Health Survey; SGRQ, Saint George Respiratory Questionnaire.

^*Correlation is significant at the 0.05 level (2‐tailed).

^**Correlation is significant at the 0.01 level (2‐tailed).