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 Lower back: Hip misalignment is associated with hyperextension and tension of the muscles in the abdomen and lower back. 2  Problems with these muscles can manifest as sore or acute lower back pain. 3  Knee: Hip misalignment may cause you to shift too much weight to one side of your body.