Fig. 1From: Positive association of Parkinson’s disease with ankylosing spondylitis: a nationwide population-based studyComparison of cumulative incidence of Parkinson disease between patients with and without ankylosing spondylitis. The Kaplan–Meier plot showed that the AS cohort had a higher cumulative incidence of PD than the non-AS cohort did (log-rank test, p < .001)Back to article page