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 general term for pain along the sciatic nerve, caused by compression of that nerve by the bones in the spine, or one of the surrounding soft tissues, such as the sacroiliac or lumbar joints, the Piriformis muscle, or the Iliolumbar ligament. A herniated disk is commonly associated with this Sciatica.