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 Arthritis â frequent cause of hip pain and almost always creates pain in the groin. 2  Bursitis â inflammation of the bursa over the outside of the hip is a common cause of pain over the side of the hip.  Lumbar pain â many back and spine problems can cause symptoms around the buttock and hip.