MPO and Crohn disease: Although there was a statistically significant age difference between patients with Crohn’s disease and patients with AAV-MPO and individuals acting as healthy controls (Figure 7D), sera IL-1R2 levels did not correlate to age in either healthy control (Figure 7E) or Crohn’s disease (Figure 7F) populations, suggesting that age was not a confounding factor for IL-1R2 level.