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

Table 3

Trace elements concentration and Cu/Zn ratio in the hair of the control group and the myopic patients.

Element	Control group (), min; med; max	Myopic patients (), min; med; max
Zn (µg/g)	4.91; 130; 588	98; 260; 1240	<0.001
Cu (µg/g)	2.95; 8.91; 21.9	0.34; 10.7; 664	0.049
Se (ng/g)	32.2; 416; 1030	22.6; 337; 5060	0.58
Mn (ng/g)	37.8; 297; 6240	107; 459; 5610	0.013
Cu/Zn ratio	0.014; 0.07; 1.82	0.001; 0.045; 0.82	0.001

^aP value for Mann–Whitney U test. Statistically significant differences at 0.01 significance level.