Table 3 CT findings and lung function test results.

		Mean z score (SEM), n
		FRC	VmaxFRC
Subpleural	None	0.78 (0.67), 12	−0.95 (0.31), 14
opacities	1	0.07 (0.92), 7	−1.66 (0.27), 11
	2	−0.35 (0.50), 7	−1.47 (0.27), 7
	3	−1.97 (0.60*), 5	−1.28 (0.52), 6
Extended linear	No	1.03 (0.73) (12)	−1.22 (0.32), 15
opacities	Yes	−0.78 (0.36*), 19	−1.35 (0.19), 23
Limited linear	No	1.76 (2.64), 2	−2.01 (1.11), 2
opacities	Yes	0.11 (0.40), 29	−1.26 (0.17), 36
Limited linear	0–2	2.10 (1.08), 7	−0.76 (0.45), 9
opacities	3–6	−0.18 (0.38*), 12	−1.54 (0.22), 16
	⩾7	−0.50 (0.62*), 12	−1.39 (0.25), 13
Large hyperlucent	No	0.39 (0.48), 21	−1.29 (0.17), 27
area(s)	Yes	−0.98 (0.66), 10	−1.32 (0.43), 11
Presence of	No	187 (20)	140 (28)
bullae	Yes	216 (11)	151 (12)

*p<0.05 compared with the reference subgroup (ie, first listed subgroup).