Concentration of Zinc, Copper, Selenium, Manganese, and Cu/Zn Ratio in Hair of Children and Adolescents with Myopia

Table 4

Hair trace elements concentration and Cu/Zn ratio in HM and MM groups.

	HM group (), min; med; max	MM group (), min; med; max		Significant differences
Zn (µg/g)	99.6; 258; 1240	149; 322; 754	<0.001	C vs HM, C vs MM
Cu (µg/g)	0.89; 10.9; 98.1	2.34; 11.5; 158	0.04	—
Se (ng/g)	22.6; 323; 4670	44.6; 280; 5060	0.42	—
Mn (ng/g)	107; 451; 5610	160; 464; 1880	0.037	—
Cu/Zn ratio	0.002; 0.045; 0.41	0.01; 0.045; 0.817	0.017	—

^aP value for Kruskal–Wallis test. Statistically significant differences at 0.01 significance level.