Table 2.

Associations of age and sex with plasma zinc level

Variables	Regression coefficient (β)	Standard error	95% Confidence intervals	P value
Step 1
Constant	10.5	1.5
Age	−0.4	0.1	−0.7 - -0.07	0.01
Step 2
Constant	10.6	1.5
Age	−0.3	0.1	−0.7 - -0.5	0.02
Sex	−1.6	0.6	−0.1 - 0.7	0.4

Pair-wise differences of zinc levels between males vs females after adjustment for age and vice-versa were assessed in a multivariate model.