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.
Different types of hip pain causes include hip bursitis, hip injury, and arthritis. In addition, hip pain can also be related to osteoporosis, which causes thinning of the bones.Sometimes hip pain is related to a broken bone.ursitis is similar to arthritis because they both cause hip pain. Bursitis, however, causes inflammation of the bursa, where arthritis causes joint inflammation.