Table 2 Correlation coefficient between abnormalities on thin section CT scans and degree of airway obstruction (FEV₁ % predicted and FEV₁/FVC%).

	EB (n = 15)	Asthma (n = 18)	Controls (n = 11)
Airway wall area percentage (WA%)	−0.04/−0.08	−0.42*/−0.54**	−0.02/−0.14
Prominence of centrilobular structure (grade)	−0.21/−0.12	−0.04/−0.11	0
Air trapping (%)	0	−0.26/−0.22	0

*p = 0.026 correlation with FEV₁ % predicted.

**p = 0.015 correlation with FEV₁/FVC%.