TABLE 5.

DIFFERENCES BY RACE IN GLOBAL INITIATIVE FOR OBSTRUCTIVE LUNG DISEASE–UNCLASSIFIED SUBJECTS

	White	African American
N	135	92
Age, yr	61.9 (8.8)	53.5 (5.6)*
Pack-years	48.4 (29.6)	36.9 (20.3)*
BMI	31.6 (6.9)	32.3 (7.8)
Current smoking, % of subjects	37.8	75.0*
FEV1 % predicted	71.3 (7.2)	69.2 (7.7)*
FEV1/FVC ratio	0.76 (0.05)	0.77 (0.05)
6MWD	1,333.1 (398.2)	1,132.1 (387.9)*
TLC, L (liters)	4.8 (1.1)	4.2 (1)*
% Emphysema	2.0 (2.2)	1.4 (1.5)*
% Gas trapping	11.5 (7.6)	12.1 (9.8)
Subsegmental wall area %	64.5 (2.1)	65.8 (2.4)*
Pi10	3.77 (0.10)	3.85 (0.14)*
Resting O2 saturation	95.9 (2.5)	96.9 (2.0)*
MMRC	1.2 (1.4)	1.6 (1.6)
SGRQ	26 (22.5)	29.9 (23.8)

Definition of abbreviations: BMI = body mass index; MMRC = Modified Medical Research Council dyspnea score; Pi10 = wall thickness for a hypothetical airway with an internal perimeter of 10 mm; SGRQ = St. George's Respiratory Questionnaire; TLC = total lung capacity; 6MWD = 6-min walk distance.

Data are presented as mean (SD) or percent.

^*Denotes P value < 0.05 when compared to white subjects.