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.
Sciatic Nerve and Pain. Sciatica is the term for nerve pain that comes from the sciatic nerve, the longest and widest nerve of the body. There are two sciatic nerves that come from each side of the spine where the low back meets the buttocks. The sciatic nerve travels down the back of each leg to the foot.