A Prospective Study on the Relationship between Iron Supplement Intake, Hemoglobin Concentration, and Risk of Parkinsonism.

Nutrients · 2022 · PMC9655462 · PMID 36364932

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near-significantno p-value reported

In contrast, hypothesis 3 was not supported as there was no significant or near-significant inverted U-shaped trend between hemoglobin concentration and parkinsonism risk, nor were there significant differences in risk between hemoglobin concentration groups stratified by clinical condition (polycythemic, anemia, and healthy) or quintiles.

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