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.
Summary. 1. Kidney pain and back pain can often be confused for one another, and for a clear diagnosis you should visit your physician. 2. The pain in the lower part of the back can be caused by pulled muscles, herniated disks, arthritis, pregnancy, or fracture of the spine. Kidney pain can be caused by kidney stones, kidney infection, kidney cancer, and polycystic kidney disease.