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 is a term to describe an irritation or pressure on the nerve, which is commonly caused by a herniated or bulging disc (also referred to as a ruptured disc, pinched nerve, or slipped disc) in the lumbar spine.ciatica. The sciatic nerve is a collection of several nerve roots that arise between your spinal bones (vertebrae). These nerve roots join together and form the largest nerve in the body, the sciatic nerve.