. 2011 Feb 15;4:6. doi: 10.1186/1755-1536-4-6

Table 3.

Pulmonary function tests (PFTs)

Variable	ES 0 (n = 48)	0 < ES ≤ 2 (n = 26)	ES > 2 (n = 28)	*P value

FEV₁% predicted; median [1st, 3rd]	53 [43, 74]	59 [48, 77]	66 [60, 76]	NS
FVC % predicted; median [1st, 3rd]	47 [38, 63]	50 [43, 62]	60 [55, 73]	< 0.01
FEV₁/FVC ratio median [1st, 3rd]	84 [81, 88]	87 [80, 89]	81 [72, 86]	< 0.05
TLC % predicted; median [1st, 3^rd]	44 [39, 57]	50 [44, 59]	64 [57, 73]	<.001
DL_CO, % predicted; median [1st, 3rd]	28 [19, 34]	31 [20, 36]	27 [20, 37]	NS

*Kruskal-Wallis one-way ANOVA ES, emphysema score; FEV₁, forced expiratory volume in one second; FVC, forced vital capacity; TLC, total lung capacity; DL_CO, diffusing capacity for carbon monoxide; NS, not significant (P > 0.05).