GSTM1 and cardiovascular disorder: As a result, the COP (standardized coefficient: 0.134) was also identified as factors affecting hepatic rSO2 in addition to BMI (standardized coefficient: 0.377), Hb levels (standardized coefficient: 0.301), a history of cardiovascular disease (standardized coefficient: -0.166), and the mean BP (standardized coefficient: 0.161) (Table 3).