Table 3– Height reduction and lung function values (using recalled tallest height (RTH) or arm span height (ASH_Parker) in the prediction equation) in categories of vertebral deformities in the study group^#

	Deformities			p-value
	0	1–2	>2
Height reduction from RTH cm	1.8±1.9	2.8±2.3	5.1±3.0	<0.0001
Subjects n	317	97	39
FEV₁ % pred^¶	42±13	42±12	37±11	0.051
FVC % pred^¶	73±16	73±15	67±13	0.084
TLC % pred⁺	122±19	119±23	120±27	0.365
RV % pred⁺	200±52	193±59	199±65	.533

Height reduction from ASH_Parker cm	2.3±2.7	2.6±3.0	4.3±2.8	<0.0001
Subjects n	264	91	39
FEV₁ % pred^¶	42±13	43±12	38±11	0.103
FVC % pred^¶	71±16	71±14	66±12	0.203
TLC % pred⁺	126±19	124±25	125±25	0.832
RV % pred⁺	210±51	205±65	208±60	0.808

Data are presented as mean±sd, 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; % pred: % predicted. ^#: n = 450 because TLC and RV were missing in three patients. ^¶: prediction equations from Johannessen et al. 12; ⁺: prediction equations from European Community for Steel and Coal 4.