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A longitudinal dataset from a 9-week psychological intervention study on 34 amateur American football players aged 16–18 years. The study administered the Competitive State Anxiety Inventory-2 Revised (CSAI-2R) before and after each game to measure changes in pre-competitive anxiety and self-confidence. The data was collected by researcher Erick Yael Fernández-Barradas and published on figshare in 2026.
Dataset is a 95.7 KB PDF file; data extraction and structuring are required for analysis. License is CC-BY-4.0.