Variance is a statistical measure which tells us how measured data vary from the average value of the set of data.
2. pertaining to or located near the sciatic nerve or vein. sciatic nerve a nerve extending from the base of the spine down the thigh, with branches throughout the lower leg and foot; it is the widest nerve of the body and one of the longest. sciatica is pain or inflammation along the course of this nerve. See anatomic Table of Nerves in the Appendices and see Plates.
Sciatica refers to the pain and discomfort caused by pressure on the sciatic nerve or nerve roots. This nerve is the longest nerve in the body which runs from the lower back and pelvis, through the hip and buttock area, down to the back of each leg, and controls many of the muscles in these areas.