TABLE 2.

Baseline characteristics of surgical patients included in the ABG substudy iso-work analysis classified as deflators and non-deflators.

Characteristic	Deflators N=24	Non-Deflators N=9	p-value
Age – yrs	69 (64–72)	66 (66–69)	0.79
Female sex – no. (%)	9 (38%)	0 (0%)	0.04
White race – no. (%)	22 (92%)	7 (78%)	0.30
BMI – kg/m2	25.1 (23.7–28.2)	27.5 (24.6–28.4)	0.55
Pack years	61 (47–90)	40 (35–80)	0.23
Upper lobe predominant distribution of emphysema on CT – no. (%)	21 (88%)	3 (33%)	0.005
FEV1 % predicted*	28 (24–33)	29 (25–30)	0.89
TLC % predicted*	128 (113–135)	133 (119–136)	0.47
RV % predicted*	201 (181–237)	195 (180–228)	0.79
DLCO % predicted†	29 (23–39)	28 (21–30)	0.37
RV/TLC	0.62 (0.59–0.67)	0.52 (0.49–0.60)	0.01
Room Air PaO2 – mmHg	64 (55–77)	55 (53–74)	0.58
Room Air PaCO2– mmHg	41 (38–43)	40 (37–45)	0.98
6 min walk distance – m	422 (349–457)	460 (422–486)	0.24
Maximal workload – W	43 (34–68)	58 (45–67)	0.24
O2 pulse – mL/beat	7.7 (6.03–9.89)	10.1 (7.96–12.36)	0.06

Definition of abbreviations: BMI = body mass index; FEV₁ = forced expiratory volume in one second, TLC = total lung capacity, RV = residual volume, DLCO = diffusing capacity of carbon monoxide Data presented as medians and interquartile ranges unless otherwise specified

^*Measurement obtained post-bronchodilator

^†Baseline DLCO was obtained prior to pulmonary rehabilitation; all other baseline pulmonary function measures were completed after pulmonary rehabilitation