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.
Causes of referred pain to the hip and groin. The lower back and sacroiliac joints are some of the most common areas of the body that, when injured, may cause pain that is referred to the hip or groin. Some of the more common conditions which may cause these symptoms include: Lumbar Disc Bulge.