ACE and latent syphilis: (p = 1.000) (Table 4) Pairwise comparison of mean (SD) difference of serum ACE level between AS and BD was −2.123 (2.894), between AS and presumed latent TB was −3.141 (3.038), between AS and presumed latent syphilis was −1.086 (5.656), between BD and presumed latent TB was −1.018 (3.149), between BD and presumed latent syphilis was 1.037 (5.689), and between presumed latent TB and presumed latent syphilis was 2.055 (5.734) respectively (Table 4).