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

Table 2

Correlation between the parameters of spirometry, smoking, exacerbations, and the modified questionnaire score.

Female	Smoking	FVC	FEV1	PEF	Exacerbation	MQ score
Smoking	1	0.0895	−0.0958	−0.1988	0.0852	−0.3347
FVC	0.0895	1	0.7983	0.5674	−0.4705	−0.3960
FEV1	−0.0958	0.7983	1	0.8197	−0.4292	−0.2691
PEF	−0.1988	0.5674	0.8197	1	−0.4438	−0.2219
Exacerbation	0.0852	−0.4701	−0.4292	−0.4438	1	0.6015
Score	−0.3347	−0.3960	−0.1691	−0.1219	0.6015	1
Male	Smoking	FVC	FEV1	PEF	Exacerbation	Score
Smoking	1	0.0072	−0.0680	0.0673	0.2357	−0.0009
FVC	0.0072	1	0.8379	0.8556	−0.4899	−0.496
FEV1	−0.0680	0.8379	1	0.8942	−0.3661	−0.4142
PEF	0.0673	0.8558	0.8942	1	−0.3318	−0.4177
Exacerbation	0.2357	−0.4899	−0.3661	−0.3318	1	0.8013
Score	−0.0009	−0.4969	−0.4142	−0.4177	0.8013	1