On average among OECD countries, there are about 14 students. per teacher at the secondary level (Table D2.2). As the differences in student-teacher ratios indicate, there are fewer full-time equivalent students per full-. time equivalent teachers at the secondary level than at the primary level of education.
Causes of Lower Back Pain. Home/Conditions/Causes of Lower Back Pain. Pain in the lower back has a multitude of causes. The discs, facets, pars interarticularis, sacroiliac joints, hip joints and nerves can all cause a form of lower back pain.
The actual hip joint can cause pain (like arthritis of the joint) but this normally causes back (butt) pain or is located in the groin area. Pain on the outside of the hip (laterally) is rarely caused by the hip, but more commonly by the muscles or tendons or bursa in the joint.