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.
Some types of arthritis and cancer can contribute to back pain. Improper lifting. Using your back instead of your legs can lead to back pain. Psychological conditions. People prone to depression and anxiety appear to have a greater risk of back pain. Smoking. This can keep your body from delivering enough nutrients to the disks in your back. Prevention