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Comparison of the serum zinc levels before (n = 49) and six months after treatment (n = 49) in the Giardia-infected schoolchildren (longitudinal analysis). A = 13.8 (1.9), *B = 19.2 (0.9), *Error Bars = (S.E.). * Non-adjusted geometric means. ** Adjusted ANCOVA (region, sex, age and intake of zinc).
