. 2015 May 28;2015(5):CD005525. doi: 10.1002/14651858.CD005525.pub3

1. Overview of study populations.

	Intervention(s) and comparator(s)	Sample size^a	Screened/eligible  [N]	Randomised  [N]	ITT  [N]	Analysed  [N]	Finishing study  [N]	Randomised finishing study  [%]	Follow‐up time^b
(1) Gómez‐García 2006	I: 100 mg/day zinc sulfate	12  (6 participants per group; 80% power)	14	7	‐	7	7	100	1 month
	C: placebo	12  (6 participants per group; 80% power)	14	7	‐	7	7	100
	total:			14	‐	14	14	100
(2) Marreiro 2006	I: 30 mg/day zinc amino chelate	‐	‐	28	‐	28	28	100	1 month
	C: placebo	‐	‐	28	‐	28	28	100
	total:			56	‐	56	56	100
(3) Soheilykhah 2012	I: 50 mg/day zinc sulfate	‐	‐	‐	‐	28	28	100	12 weeks
	C: regular exercise and weight control	‐	‐	‐	‐	25	25	100
	total:			58	‐	53	53	91.4
*Grand total*	*All interventions*			63			63
	*All comparators*			60			60
	*All interventions and comparators*			*128*			*123*

^aAccording to power calculation in study publication or report  ^bDuration of intervention and/or follow‐up under randomised conditions until end of study

"‐" denotes not reported

C: comparator; I: intervention; ITT: intention‐to‐treat.