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.
Problems with the hip joint can often cause back/buttock pain that radiates to the groin and thigh. Irriation to the lumbar nerve roots in the lower back can also cause leg pain. Thigh pain is often seen with irritation to the l2, l3, and/or occasionally L4 nerve roots. ...Read more