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.
The sciatic nerve is a large nerve that originates from the distal spinal cord and extends along nearly the entire length of the hind limb. In most vertebrates, it's the major branch of the sacral plexus, a complex mass comprised of neurons that exit the spinal column via spinal nerves L4 through S4.