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.
Hip pain frequently is caused by a problem in the spine, due to a herniated disc causing sciatica which radiates into the area of the hip. If you have pain in the hip, some common causes: Arthritis â frequent cause of hip pain and almost always creates pain in the groin.