Characteristics of patients
| Group D | Group N | |
| Gender (male/female) | 34/26 | 36/24 |
| Age (years) | 59.65±12.26 | 59.52±12.66 |
| ASA-PS (II/III/IV) | 45/15/0 | 47/12/1 |
| BMI (kg/m2) | 22.11±3.49 | 21.68±3.22 |
| Wrist circumference* (cm) | 15.58±1.16 | 15.46±1.17 |
| History of arterial puncture (%) | 10.0 | 15.0 |
*Circumference at the radial styloid process perpendicular to the long axis of the forearm.
ASA-PS, American Society of Anaesthesiologists Physical Sstatus; BMI, Body Mass Index.