LYZ and Behcet disease: The estimated means of serum lysozyme levels of patients with AS, BD, presumed latent TB and presumed latent syphilis were 14.122, 14.374, 14.998 and 13.989 mg/L respectively which were lower than the estimated marginal mean value of lysozyme for presumed sarcoidosis, and higher than the estimated marginal mean value of serum lysozyme for control group (Fig. 2).