Table 1.
Criteria for inclusion of studies based on the Population, Exposure, Comparator, Outcome, Time (PECOT) framework.
Fig 1.
PRISMA flow diagram of article selection for systematic review and meta-analysis of folate deficiency among adolescent girls 2025.
Table 2.
Characteristics of the included studies and their proportion of folate defiecency among adolescent girls, 2025.
Fig 2.
Forset plot for the proportion of folate defiecency among adolecent girls.
Fig 3.
Forest plot result of subgroup analysis by WHO region for the proportion of folate defiecency among adolecent girls, 2025.
Fig 4.
Forest plot result of subgroup analysis by publication year for the proportion of folate defiecency among adolecent girls, 2025.
Fig 5.
Forest plot result of subgroup analysis by sample size for the proportion of folate defiecency among adolecent girls, 2025.
Fig 6.
Forest plot result of subgroup analysis by type of biological sample for the proportion of folate defiecency among adolecent girls, 2025.
Table 3.
Study-specific cut-off values for red blood cell and serum folate concentrations for the study the proportion of folate defiecency among adolecent girls, 2025.
Fig 7.
Funnel plot for the study the proportion of folate defiecency among adolecent girls, 2025.
Table 4.
Egger’s of Publication Bias of Included Studies in the Systematic Review and Meta-Analysis the Proportion of Folate Defiecency Among Adolecent Girls, 2025.
Fig 8.
Trim and fill analysis result of the study the proportion for folate defiecency among adolecent girls, 2025.
Fig 9.
Leave-one-out sensitivity analysis of pooled prevalence of folate deficiency among adolescent girls.
Table 5.
Meta-regression analysis of study-level factors associated with heterogeneity in folate deficiency among adolescent girls.
Table 6.
Certainty assessment for included outcomes for the folate defiecency among adolescent girls, 2025.