The study found a significant causal relationship between coffee intake and obsessive-compulsive disorder, showing a negative correlation. There was no causal relationship between coffee intake and other mental disorders. The sensitivity analysis test found no pleiotropy affecting the results, and no single nucleotide polymorphism had a major impact on the robustness of the results, indicating that the results are stable and reliable.
Keywords: Coffee intake; Mendelian randomization; Mental disorders; Obsessive‐compulsive disorder.
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