TABLE 1

Results for the 13 829 patients expressed as z-scores from Global Lung Function Initiative (GLI) for spirometry [11] and transfer factor of the lung for carbon monoxide (T_LCO) [2]

	Median	Interquartile range	Range (minimum–maximum)
Age years	60.48	48.9 to 70.2	20.0 to 96.7
Survival years	3.52	1.4 to 7.7	0.0 to 19.9
FVC z-score	−0.872	−1.8 to 0.0	−6.7 to 9.8
FEV₁ z-score	−1.503	−2.6 to −0.6	−6.6 to 10.4
FEV₁/FVC z-score	−1.010	−2.3 to −0.1	−6.1 to 3.9
FEV₁/FVC	0.718	0.6 to 0.8	0.1 to 1.0
T_LCO z-score	−1.430	−2.8 to −0.3	−13.0 to 5.2
MT_LCO z-score	−1.499	−2.4 to −0.7	−6.3 to 5.3
K_CO z-score	−0.584	−1.8 to 0.5	−9.2 to 16.6
V_A z-score	−1.120	−2.2 to −0.2	−11.3 to 3.3
T_LCOPP	78.9	60.8 to 95.6	7.0 to 193.0

FVC: forced vital capacity; FEV₁: forced expiratory volume in 1 s; M: derived using Miller et al. [12] equations; K_CO: transfer coefficient of the lung for carbon monoxide; V_A: alveolar volume; PP: % predicted from GLI equations.