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 problems. Problems with the hip joint can be identified as back pain or hip pain, when the source is actually the ball and socket joint where the leg meets the pelvic bones. Cancer. Back pain as an initial symptom of cancer is not likely, but a cancer that presses on the spine â or has spread to the bones of the spine â will cause pain.