Fig. 3. Delayed-type hypersensitivity skin test. Delayed-type hypersensitivity is presented as the median (quartiles 25–75) of the skin test area of delayed-type hypersensitivity responses in square millimeters. *P < 0.05; number of positive reactions in long-term alcoholics (before surgery [preop], 1.5 [1–2]; 48 h after surgery [postop], 1.0 [1–2]) and nonalcoholics (preop, 2 [2–4]; postop, 3 [2–4]); P < 0.05.