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 an inflammation of the sciatic nerve, the longest nerve in the body, which runs from the spinal cord across the buttock and hip area and down the back of each leg. Sciatica is actually a secondary symptom of another problem placing pressure upon the nerve, most often a herniated disk.