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.
Inflammatory causes of back pain: Inflammatory causes of back pain refers to back discomfort caused by an inflammatory disease, disorder, or condition. See detailed information below for a list of 7 causes of Inflammatory causes of back pain, Symptom Checker, including diseases and drug side effect causes. Causes of Inflammatory causes of back pain: