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.
Certain diseases also lead to hip injuries or problems that may be treated by your doctor and/or Orthopedic Surgeon. Patient may also experience hip pain due to pathology originating from low back spine including disk herniation, sacroiliac disease, facet joint arthritis or spinal stenosis.