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.
Tight Hips Can Cause Lower Back Pain. This is an image of a woman in a type of pigeon pose while also bringing her leg up to hold it. The amount of muscles that need to be flexible in order to do this pose is multiple, but people often donât know that being too flexible can be dangerous for the joints too.