Maintained Smoking Cessation for 6 Months Equilibrates the Percentage of Sputum CD𝟖⁺ Lymphocyte Cells with That of Nonsmokers

Table 1

Subject characteristics.

	Smokers			Nonsmokers (controls)	𝑃-value*
	Total	Successful quitters at 6 months	Nonquitters
N	68	21	47	10	N/A
Sex, M/F	59/9	19/2	40/7	8/2	𝑃=.6
Age, (in years)	49±8	49±7	49±9	33±9	𝑃=.002
Smoking (pack-years)	57±18	53±15	59±19	N/A	N/A
FEV1, %pred Postbronchod.	105±12	109±13	104±11	116±13	𝑃=.2
ΔFEV1 % pred	2.1±1.8	2.4±2.3	1.9±2.2	1.9±1.4	𝑃 = .16
Fagerstrom Score	8±1	7±1	8±1	N/A	N/A

Data are presented as mean ± SD, or in absolute numbers, N/A: non applicable, FEV1: forced expiratory volume in one second; ΔFEV1: change in FEV1 after bronchodilation.
^∗𝑃-value between controls and successful quitters.