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.
Pain from the back and spine also can be referred and felt around the buttocks and hip, Siegrist says. Sciatica, a pinched nerve, can cause pain in the back of the hip â the pain from sciatica can start in your lower back and travel down to your buttocks and legs.