Table 3.

Contents of Zn, Cu and Se in sera of healthy, gastric cancer and other tumor groups (^-x ± s)

	n	Zn(mg/L)	Cu(mg/L)	Se(μg/L)	Cu/Zn
Healthy (I)	294	0.905 ± 0.010	0.914 ± 0.011	83.22 ± 1.32	1.044 ± 0.018
Gastric cancer (II)	109	0.843 ± 0.019	1.045 ± 0.023	73.58 ± 1.68	1.308 ± 0.035
Other tumor (III)	48	0.858 ± 0.028	1.127 ± 0.040	75.29 ± 2.33	1.404 ± 0.078
Analysis of variance		F = 5.137	F = 29.168	F = 9.278	F = 35.220
		P = 0.006	P < 0.00001	P = 0.000073	P < 0.000001
Newmen-Keul test in	I:III	q = 4.305a	q = 7.660b	q = 5.852b	q = 9.423b
comparison of different	I:II	q = 2.362b	q = 8.949b	q = 3.426a	q = 9.113b
groups	II:III	q = 0.673	q = 3.094	q = 0.664	q = 2.673