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. 2015 Feb 9;10(2):e0116558. doi: 10.1371/journal.pone.0116558

Table 4. Pulmonary function values for males by smoking habit per study stage.

	Low exposure group						High exposure group
	0<Mn-CEI<1 (N = 407)						Mn-CEI≥1 (N = 631)
	non-smoking (n = 113)		Smoking (n = 294)				non-smoking (n = 405)		Smoking (n = 226)
Variables	Mean	SE	Mean	SE		P value	Mean	SE	Mean		SE	P value
FVC, L	4.40	0.06	4.39	0.04		0.889	4.19	0.05	4.09		0.04	0.094
FVC% pred	11.08	1.60	111.01	0.99		0.969	109.74	1.19	106.79		0.89	0.047
FEV₁, L	3.79	0.06	3.79	0.04		0.918	3.51	0.04	3.46		0.03	0.377
FEV₁% pred	113.30	1.81	113.58	1.12		0.896	110.03	1.28	107.62		0.95	0.132
FEV₁/FVC	86.23	0.87	86.97	0.54		0.475	85.20	0.49	84.2		0.66	0.225
FEV₁/FVC% pred	110.60	1.16	111.21	0.72		0.657	112.39	0.65	111.01		0.87	0.204
MMEF,L/s	4.71	0.12	4.85	0.07		0.307	4.46	0.09	4.25		0.06	0.052
MMEF% pred	101.57	2.60	105.08	1.61		0.253	102.66	1.96	97.73		1.47	0.045
PEFR,L/min	8.49	0.25	8.40	0.15		0.751	8.22	0.16		7.97	0.12	0.218
PEFR% pred	92.67	2.67	91.66	1.65		0.746	90.13	1.81		87.07	1.34	0.175
MVV,L	151.34	2.36	151.74	1.46		0.886	140.32	1.62		138.32	1.21	0.325
MVV% pred	149.17	2.36	147.62	1.46		0.576	144.06	1.70		140.58	1.27	0.101