TABLE 5

Correlation of daily and clinical visit versions of PROactive Physical Activity in COPD (chronic obstructive pulmonary disease) instruments (D-PPAC and C-PPAC, respectively) with health status, dyspnoea and exercise capacity (convergent validity)

	CRQ dyspnoea	CRQ fatigue	CCQ total	CAT	mMRC	6MWD
D-PPAC
Factor 1: amount with Dynaport	0.36*	0.18*	−0.20*	−0.23*	−0.42*	0.55*
Factor 1: amount with Actigraph	0.34*	0.17*	−0.19*	−0.20*	−0.41*	0.55*
Factor 2: difficulty	0.74*	0.66*	−0.72*	−0.66*	−0.56*	0.41*
C-PPAC
Factor 1: amount with Dynaport	0.36*	0.37*	−0.37*	−0.38*	−0.53*	0.62*
Factor 1: amount with Actigraph	0.35*	0.36*	−0.34*	−0.37*	−0.55*	0.65*
Factor 2: difficulty	0.86*	0.73*	−0.85*	−0.82*	−0.70*	0.49*

Bold type represents the observed correlations agreed with the expected correlations set by a panel of experts. CRQ: chronic respiratory questionnaire; CCQ: clinical COPD questionnaire; CAT: COPD assessment test; mMRC: modified Medical Research Council dyspnoea scale; 6MWD: 6-min walking distance. *: p<0.05.