Table 5. Partial correlation analysis between Mn-CEI and pulmonary function values of workers.

	Male				Female
Variables	r1 (N = 226)	P value	r2 (N = 405)	P value	r3 (N = 618)	P value
FVC, L	-0.072	0.287	-0.056	0.260	0.029	0.468
FVC% pred	-0.073	0.280	-0.021	0.677	0.050	0.216
FEV1, L	-0.087	0.198	-0.092	0.064	0.066	0.104
FEV1% pred	-0.107	0.111	-0.031	0.534	0.071	0.079
FEV1/FVC	-0.027	0.686	-0.067	0.177	0.039	0.332
FEV1/FVC% pred	-0.042	0.533	-0.037	0.456	0.035	0.392
MMEF,L/s	-0.159	0.018	-0.055	0.268	0.042	0.293
MMEF% pred	-0.163	0.015	-0.021	0.674	0.051	0.205
PEFR,L/min	-0.058	0.392	-0.040	0.420	0.074	0.067
PEFR% pred	-0.086	0.200	-0.040	0.424	0.086	0.079
MVV,L	-0.087	0.197	-0.089	0.074	0.066	0.103
MVV% pred	-0.043	0.525	-0.032	0.524	0.070	0.615

r₁, the partial correlation coefficients of smoking male workers in the high exposure group

r₂, the partial correlation coefficients of non-smoking male workers in the high exposure group

r₃, the partial correlation coefficients of female workers