I would rate this page as a 7 out of 10.
The page provides a clear definition of lumbago as an old term used to describe pain in the lower back. It also mentions that lumbago is a common back complaint affecting 80% of the Western world. This information is helpful and informative.
However, the page could benefit from providing more details about the causes and symptoms of lumbago. While it mentions that lumbago can be caused by overworking the joints in the lower back, it also states that it can be caused by rheumatoid arthritis and other infections. It would be helpful to provide more information about these potential causes and how they relate to lumbago.
Additionally, the page could benefit from providing information about treatment options for lumbago. This would help readers understand how to manage and alleviate their pain.
The page provides a good introduction to lumbago but could benefit from more detailed information about its causes and treatment options.