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 in the hip can result from a number of factors. Abnormalities of the skin, nerves, bones, joints, blood vessels, and soft tissues of the hip can all result in pain. Sometimes diseases that affect other joints in the body, such as the inflammation resulting from arthritis, can be the cause of pain in the hip. Trauma or injury, including bone fracture, is also a cause of hip pain.