The Q1-Q4 of cystatin C represent < 0.659, < 0.753, < 0.877 and ≥ 0.877; the Q1-Q4 of serum creatinine represent < 0.7, < 0.8, < 1.0 and ≥ 1.0; the Q1-Q4 of Sarcopenia Index represent < 88.41, < 106.24, < 125.52 and ≥ 125.52 The gene discussed is CST3; the disease is sarcopenia.