Fig 1.
The flow diagram of the selection process.
Table 1.
Characteristics of included studies.
Table 2.
The Newcastle-Ottawa scale score of included studies.
Fig 2.
Forest plot for the random-effects meta-analysis of serum ferritin levels in persons with ADHD and controls.
Fig 3.
Forest plot for the random-effects meta-analysis of serum iron levels in persons with ADHD and controls.
Table 3.
Pooled estimate and heterogeneity in subgroups analyses.
Fig 4.
Galbraith radial plot graph of included studies.
Table 4.
The sensibility analysis of included studies for serum ferritin.
Table 5.
Meta-regression of serum ferritin levels ADHD and controls.
Fig 5.
Funnel plot for publication bias test between-group meta-analysis (A) on serum ferritin levels (B) on serum iron levels.