Fig 1.
Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) diagram of the detailed process of selection of studies for inclusion in the systematic review and meta-analysis.
Table 1.
Characteristics of included studies that analyzed the relationship between antioxidant and pain symptoms in endometriosis patients.
Fig 2.
Risk of Bias version 2 (RoB v2) quality assessment of clinical trial studies that shows some-concern risk of bias in four clinical trials and low-risk of bias in one clinical trial study.
Fig 3.
Forest plot that demonstrates antioxidant supplementation containing combination of vitamin C and vitamin E was associated with higher proportion of endometriosis patients who achieved reduction in the chronic pelvic pain (A), dysmenorrhea (B), and dyspareunia (C) symptoms.