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.
Pain in the hip area may also originate from painful infections or other conditions of the skin, such as shingles. Hip pain may also occur because of a problem with the back or spine. Depending upon the cause of hip pain, the pain may occur when walking, running, or engaging in activity. Bursitis of one of the two bursae of the hip (sacs that provide cushioning between bones and tissues) can cause hip pain.
Back pain is more common in people who are not fit. Being overweight. A diet high in calories and fat can make you gain weight. Too much weight can stress the back and cause pain. Heredity. Genes play a role in some causes of back pain, such as certain types of arthritis. Other diseases. Some types of arthritis and cancer can cause back pain. Your job. If you have to lift, push, or pull while twisting your spine, you may get back pain. If you work at a desk all day and do not sit up straight, you may also get back pain. Smoking.