Fixed airways obstruction among patients with severe asthma: findings from the Singapore General Hospital-Severe Asthma Phenotype Study

Table 4 Multiple linear regression of factors correlated with postbronchodilator FEV ₁ % predicted

Factor	Coefficient	p-value	Importance
Prebronchodilator FVC (% predicted)	0.709	<0.001	0.666
Prebronchodilator (FEV₁/FVC %)	0.606	<0.001	0.294
Pack-year smoking history	-0.293	0.049	0.024
Admissions in the past year	-4.921	NS	0.016

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