. Author manuscript; available in PMC: 2012 Apr 1.

Published in final edited form as: Respir Med. 2010 Dec 10;105(4):588–594. doi: 10.1016/j.rmed.2010.11.015

Table 1.

Characteristics of study subjects

	Frequent exacerbators	Non-exacerbators	p-value
Total Number of Subjects	192	153	--
Age	68 (8.4)	69.3 (8.1)	0.14
Male (%)	43.2	49.7	0.28
Non-white race (%)	5.7	3.3	0.31
Did not complete high school (%)	21.9	17.7	0.35
BMI	28.3 (6.4)	28.8 (7.1)	0.48
Pack-years	60.8 (32.6)	64.0 (36)	0.55
Current smoker	18.9	27.5	0.07
Chronic cough	50.0	43.1	0.23
Chronic sputum	47.9	50.3	0.67
FEV₁ % predicted^*	34.7 (8.8)	35.9 (8.6)	0.20
FVC % predicted^*	63.9 (15.8)	64.4 (14.7)	0.78
FEV/FVC ratio^*	0.42 (0.11)	0.43 (0.11)	0.47
FEF_25–75 % predicted^*	15.1 (6.5)	16.1 (6.1)	0.05
MMRC^†^§	2.6 (0.8)	2.3 (1.1)	0.02
Physician diagnosed asthma (ever)	36.5	25.5	0.04

Data are presented as percent or mean (SD).

Lung function variables reported are post-bronchodilator values.

^§

Modified Medical Research Council Dyspnea scale (0–4, 4 representing severe shortness of breath).

^†

22.6% subjects did not have MRC score available.