Table 3.

Serum levels of Zn and Cu and their correlation with lifestyle habits

Variable	Serum Cu (mg/L)	Serum Zn (mg/L)	Cu/Zn
Vegetarian diet n=170	1.690 ± 0.05	1.403 ± 0.03	1.41 ± 0.070
Mixed diet n=107	1.672 ± 0.06	1.509 ± 0.04	1.28 ± 0.088
P value	0.777	0.091	0.250
Chewing habit n=15	1.591 ± 0.10	1.477 ± 0.10	1.12 ± 0.15
No chewing habit n=262	1.693 ± 0.04	1.442 ± 0.03	1.37 ± 0.057
P value	0.591	0.792	0.145
Caffeine consumption n=237	1.730 ± 0.04	1.471 ± 0.03	1.41 ± 0.060
No caffeine consumption n=40	1.439 ± 0.08*	1.641 ± 0.09**	1.06 ± 0.117*
P value	0.017	0.008	0.010

The data are presented as mean ± SE. *; P<0.05, **; P<0.01 show significant differences between two variables groups based on independent student’s t test, Cu; Copper, and Zn; Zinc.