TABLE 9.

Summary of forest plot analyses of the effect of zinc supplementation in infants and children aged ≤3 y on serum/soluble transferrin receptor (mg/L), analyzed by duration, chemical formula, and comparator group¹

		References	Mean difference	95% CI	P	I 2
By treatment duration	>3 mo	(12, 28, 36, 47, 74)	0.19	0.08, 0.29	<0.001	89
By chemical formula	Zn sulfate	(12, 47)	0.18	0.07, 0.29		97
	Zn acetate	(28)	0.44	−1.08, 1.96		63
	Not stated	(36, 74)	0.26	−0.13, 0.65		0
	Overall		0.19	−0.08, 0.29	<0.001	89
Zinc vs. placebo and (ii) high-dose vs. low-dose zinc		(12, 28, 36, 47, 74)	0.43	−0.16, 0.93	0.08	76
High-dose vs. low-dose		(74)	−0.10	−1.19, 0.99	0.86	NA

¹NA, not applicable.