TABLE 6.

CHARACTERISTICS OF OBESE VERSUS NONOBESE GLOBAL INITIATIVE FOR OBSTRUCTIVE LUNG DISEASE–UNCLASSIFIED SUBJECTS

	Obese	Nonobese
N	133	94
Age, yr	58.0 (8.8)	59.3 (8.6)
Sex, % male	46.6	50.0
Race, % African American	39.9	41.5
Pack-years	44.5 (27.7)	42.5 (25.7)
Current smoking (%)	49.6	57.5
FEV1 % predicted	70.0 (7.5)	71.0 (7.4)
FEV1/FVC ratio	0.77 (0.05)	0.76 (0.05)
6MWD	1,190.4 (412.1)	1,338.4 (381.3)*
% Emphysema	1.7 (1.7)	1.8 (2.3)
% Gas trapping	10.9 (6.2)	13.2 (11.0)
Subsegmental wall area %	65.1 (2.3)	64.9 (2.4)
Pi10	3.82 (0.13)	3.78 (0.11)*
Resting O2 saturation	95.8 (2.5)	96.9 (1.9)*
MMRC	1.7 (1.5)	1.0 (1.3)*
SGRQ	31.9 (24.2)	21.5 (19.9)*

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; 6MWD = 6-min walk distance.

Data are presented as mean (SD) or percent. “Obese” is defined as BMI ≥ 30, and “nonobese” as BMI < 30.

^*Denotes P < 0.05 when compared with obese subjects.