. 2017 Apr 10;14(4):360–369. doi: 10.1177/1479972317702139

Table 5.

Multivariate linear regression model of factors associated with diagnostic delay.

	Dependent variable
	Diagnostic delay (years)
Gender: Female	4.5^a (0.9)
Non-smoker	−5.1^a (1.2)
Smoker	−5.3^a (1.8)
BMI	0.8^a (0.1)
FVC	−0.1^a (0.03)
SaO₂	−0.2 (0.1)
Type of expectoration: white or yellow	−3.9^a (1.3)
Type of expectoration: yellow or green	−4.5^a (1.4)
Type of expectoration: none	−0.04 (1.3)
Death	3.6^b (1.4)
Age at onset of symptoms	−0.3^a (0.02)
Constant	30.8^b (13.0)

BMI: body mass index; FVC: forced vital capacity; SaO₂: oxygen saturation.

^a p < 0.01.

^b p < 0.05.