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.
Overuse, injury, and disease can cause pain and affect the functionality of the hip joint. When the muscles, ligaments, and tendons are put under stress from repeated movements, they may become inflamed, causing hip pain. Fractures or dislocations from falls or other accidents are also a common cause of hip injuries.