2.4.1. The Visual Analog Scale (VAS)
pain
A visual analog scale (VAS) was used to measure pain intensity. The scale consists of a solid line divided by numbers from 0 to 10, with 0 on the far left, which indicates the absence of pain, and 10 on the far right, which indicates unbearable pain. The VAS is the most commonly used measure of pain in clinical practice, with a high degree of resolution. The patient marks on the line the point that they feel represents their perception of their current state [