IL13 and chronic rhinosinusitis with nasal polyps: The levels of TH 2-associated cytokines, such as IL-5, IL-6, and IL-13 in the CRSwNP(I) and CRSwNP(II), were significantly higher than in the two control groups, and there were significant differences between the CRSwNP(I) and CRSwNP(II) groups.