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.
Get help from a doctor now âº. Hip or back pain: Hip joints will commonly cause groin and anterior (front) thigh pain. The low back will commonly cause buttock and posterior (back) thigh pain but can also refer pain to the groin, especially the lower disc segments.