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.
1) You may have an abdominal condition causing pain radiating to your back. 2) You may have a back condition radiating pain to your abdomen. 3) You may have a problem with something in your abdomen, and a problem with something in your back and they are completely unrelated. The abdomen and pelvis contain multiple organs and organ systems. Infections, diseases and any other problems that may occur, within any of these systems, have the potential to cause back and abdominal pain. They could cause upper, mid, or lower back pain. Medical Marijuana can Relieve and Control.