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Comparison of previous and current meta-analyses
| Study | Study designs included | Manganese exposure measure | Observed effect |
|---|---|---|---|
| Scassellati et al21 | Case–control | N/A | N/A |
| Rodríguez-Barranco et al17 | Case–control, cohort, cross-sectional | Blood, cord blood, hair, placenta, tooth, water | Full-scale IQ, performance IQ, verbal IQ |
| Current study | Case–control, cross-sectional | Blood, hair | ADHD |
Abbreviations: ADHD, attention-deficit/hyperactivity disorder; IQ, intelligence quotient; N/A, not available.
