Table 1– Subject characteristics for part of the study group and the control group

	Study group	Control group	p-value
Males/females n	223/230	213/212	0.792
Age yrs	63 (32–83)	65 (50–80)	0.001
Subjects with vertebral deformities^#	136 (30)	89 (21)	0.002
Vertebral deformities per subject	0.8 (0–13)	0.5 (0–11)	0.001
Height cm	169 (146–193)	169 (142–196)	0.866
FEV₁ L	1.3 (0.4–3.0)
FVC L	2.8 (1.1–6.1)
TLC L	7.6 (3.2–13.2)
RV L	4.6 (1.8–9.7)

Data are presented a mean (range) or n (%), unless otherwise stated. FEV₁: post-bronchodilator forced expiratory volume in 1 s; FVC: post-bronchodilator forced vital capacity; TLC: total lung capacity; RV: residual volume. ^#: vertebral deformities with semi-quantitative grade >0.