To this end, we segregated the patients in our study according to the recorded perfusion index (PI), the concentration of total hemoglobin (Hb), the fractional saturation of carboxy-hemoglobin (FCOHb, Figure S1) and of met-haemoglobin (FMetHb, Figure S1), BMI, body height, weight, wrist circumference, the ASA Score, skin tonality (Fitzpatrick Scale), degree of hairiness on the forearm, the presence of arrhythmia as well as postoperative shivering of the patients (Figures 5 and S3). Here, GSTM1 is linked to cardiac arrhythmia.