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 âThat will cause referral down the leg, and you will have hip and leg pain.â Herniated disks (spinal disks that press on the nerves) and sciatica (pain or weakness involving the sciatic nerve in the lower back) are the most common back and spine problems that refer pain to the hip region.  Hip and shoulder pain.