GSTM1 and sarcopenia: Along with the PMV, BMI (0.164), bilirubin (0.158), preoperative Hb (0.132), albumin (0.131), total protein (0.123) and age (0.113) were key features for sarcopenia prediction; PMV, BMI, Hb, total protein and age also showed statistical significance (p < 0.05) in a univariate analysis.