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(A–C) Thyroid-stimulating hormone (TSH) and general, physical, and mental fatigue [multidimensional fatigue inventory (MFI)] in patients with FSS. Controlling for age, Body mass index (BMI), smoking, and intake of medication, the association between TSH and physical fatigue was significant (β = -0.47, p = 0.007), while there was a trend in terms of TSH and general fatigue (β = -0.32, p = 0.064). By contrast, TSH was found unrelated to mental fatigue (β = -0.29, p = 0.108).
