. 2012 Oct 29;7:743–755. doi: 10.2147/COPD.S35497

Table S2.

Correlation table between clinical variables and specific items in the questionnaire used in the COPEX study

		Year-round activity	Domestic activities (Q4)	FEV₁ from expected	DLCOcVA from expected	Subjective dyspnea MRC scale	Mobility score (Q7)	AQ20 score	15D score
Year-round activity	Correlation coefficient	1.000	−0.137^**	−0.174^**	−0.195^**	0.266^**	−0.314^**	0.188^**	−0.226^**
Year-round activity	N	679	679	662	274	642	538	679	654
Domestic activities (Q4)	Correlation coefficient		1.000	0.089^*	0.033	−0.241^**	0.368^**	0.088^*	0.165^**
Domestic activities (Q4)	N		697	679	283	656	550	697	671
FEV₁ from expected	Correlation coefficient			1.000	0.278^**	−0.358^**	0.172^**	−0.222^**	0.142^**
FEV₁ from expected	N			679	283	638	536	679	655
DLCOcVA from expected	Correlation coefficient				1.000	−0.254^**	0.088	0.167^**	0.104
DLCOcVA from expected	N				283	263	224	283	279
Subjective dyspnea	Correlation coefficient					1.000	−0.457^**	0.483^**	−0.452^**
MRC scale	N					656	527	656	632
Mobility score (Q7)	Correlation coefficient						1.000	−0.326^**	0.403^**
Mobility score (Q7)	N						550	550	528
AQ20 score	Correlation coefficient							1.000	−0.705^**
AQ20 score	N							697	671
15D score	Correlation coefficient								1.000
15D score	N								671

Notes:

P < 0.05;

^**

P < 0.01.

Abbreviations: COPEX, COPd Exercise Study; DLCOcVA, diffusing capacity corrected for alveolar volume; MRC, British Medical Research Council; FEV₁, forced expiratory volume in 1 second.