How many people in Canada have ankylosing spondylitis?

Ankylosing spondylitis (AS) affects approximately 0.1% to 0.5% of the Canadian population, which translates to roughly 30,000 to 150,000 individuals. The prevalence can vary based on factors such as genetics and Demographics. AS is more common in males and often develops in late adolescence or early adulthood. Accurate figures may vary, as many cases might go undiagnosed.