Age-adjusted characteristics of the study subjects according to dietary zinc intake and serum zinc levels1.

1 All results except each median value and age were adjusted for age, and all nutrient intakes are total energy-adjusted values. Values are expressed as the mean ± SE or percentage (%). Mean values with different superscripts (a, b, c) within a row were significantly different among the three groups by Tukey’s multiple comparison test.2P for linear trend was determined by the general linear model for continuous variables and by the Cochran-Mantel-Haenszel test for categorical variables.3≥ High school graduates (12 years of education)4 ≥3 times/wk and ≥ 30 min/sessionAge-adjusted characteristics of the study subjects according to dietary zinc intake and serum zinc levels1.