Model for Developing a Health-Related Quality of Life Questionnaire for Chronic Obstructive Pulmonary Disease

Table 3

Cronbach’s α coefficient for the five questionnaires conducted.

	Cronbach’s α	Std. α	G6 (smc)	Average R
Total	0.8944	1	1	1
MQ	0.95	1	1	1
SGRQ	0.8312	1	1	1
mMRCDyspnea Scale	0.7674	1	1	1
SF-36 Scale	0.8204	1	1	1
HADS	0.8697	1	1	1