Table 1. Characteristics of included studies.

NR: Not reported.

Author name	Year	Population	Follow-up duration	Groups	Sample size	Mean age (Years)	Males (%)
Aller R et al. [12]	2015	Adults	3 Months	Vitamin E	18	NR	61.10%
				Control	18
Anushiravani A et al. [13]	2019	Adults	3 Months	Vitamin E	30	NR	NR
				Control	30
Bril F et al. [14]	2019	Adults	18 Months	Vitamin E	36	58.5	92.64%
				Control	32
Lavine JE et al. [15]	2011	Children	30 Months	Vitamin E	58	13.25	81%
				Control	57
Nobili V et al. [16]	2006	Children	12 Months	Vitamin E	43	12.23	31.80%
				Control	45
Nobili V et al. [17]	2008	Children	24 Months	Vitamin E	25	NR	69.80%
				Control	28
Pervez MA et al. [18]	2018	Adults	12 Months	Vitamin E	31	44.3	45.31%
				Control	33
Vajro P et al. [19]	2004	Children	5 Months	Vitamin E	14	10.33	44.50%
				Control	14
Wang CL et al. [20]	2008	Children	3 Months	Vitamin E	19	13.72	68.40%
				Control	38