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.
Sciatica is a fairly common cause of hip pain. Sciatica is pain from the sciatic nerve being compressed or âpinchedâ. Often times this is due to problems in the lower back, such as herniated discs. Sciatic pain runs down from the lower back into the hips and rear. The pain normally ends down in the leg before the knee.