Chronic idiopathic urticaria was studied as a clinical model for urticarial conditions, since the underlying pathophysiology is similar, regardless of etiology, and because chronic patients can be more easily recruited prospectively.
Urtikaarsete seisundite uurimisel kasutati mudelina kroonilist idiopaatilist urtikaariat, kuna sõltumata haiguse etioloogiast on patofüsioloogia sarnane ning kroonilise haigusega patsiente on lihtsam jälgimise alla võtta.