We excluded from analysis the following, partially overlapping groups of patients: those over the age of 70 years or below 30 years (for being less relevant when sarcopenia and frailty are looked for: above the age of 70 years, frailty becomes significantly more common, and below the age of 30 years it is rare to non-existent), patients with unavailable values of TSH and/or ALT, patients treated with Amiodarone, and patients diagnosed with thyroiditis or status post-thyroidectomy. Here, GPT is linked to thyroiditis.