Ankylosing spondylitis is part of a group of related diseases known as spondyloarthropathies. In the United States, spondyloarthropathies affect 3.5 to 13 per 1,000 people.
How many people are affected by ankylosing spondylitis ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: How many people are affected by ankylosing spondylitis ? [/INST] \n Ankylosing spondylitis is part of a group of related diseases known as spondyloarthropathies. In the United States, spondyloarthropathies affect 3.5 to 13 per 1,000 people.</s>