IL4 and generalized anxiety disorder: The correlation of serum S100B and IL-1β, IL-2, IL-4, and IL-10 levels in GAD cases with age was r = −0.065, P = 0.505, r = −0.147, P = 0.128, r = −0.056, P = 0.568, r = 0.013, P = 0.893, and r = −0.113, P = 0.244, respectively.