Table 3:

Correlations of serum zinc, copper and selenium with duration of disease and the severity

		Duration1	Skin severity2	Oral severity2
Serum zinc	r	−0.045	0.024	−0.104
	P value	0.77	0.87	0.50
Serum selenium	r	−0.071	0.045	0.12
	P value	0.65	0.77	0.43
Serum copper	r	−0.073	0.22	−0.129
	P value	0.64	0.145	0.41

^1-Pearson’s correlation coefficient

^2-Spearman’s rho