Validation of the Clinical COPD Questionnaire (CCQ) in primary care

Table 2 Baseline mean values in each of the instruments for the entire study sample

Domain	SGRQ Mean ± SD	CCQ Mean ± SD	Correlation Spearman	SGRQ Cronbachs alpha	CCQ Cronbachs alpha
Total**	40.91 ± 17.89	2.33 ± 1.03	0.84	0.90	0.84
Symptoms**	47.91 ± 21.92	2.57 ± 1.17	0.70	0.75	0.67
Functional State^#/Activity*	54.68 ± 23.84	2.03 ± 1.22	0.74	0.84	0.86
Mental State^#		2.44 ± 1.75			0.82
Impacts*	30.93 ± 18.16			0.82

** Domain shared by both instruments. * Domain in SGRQ only. # Domain in CCQ only. SGRQ alpha calculated on weighted items. SGRQ = St Georges Respiratory Questionnaire, CCQ = Clinical COPD Questionnaire.

ISSN: 1477-7525