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IL-18 serum levels in nonsmoking CP patients (N = 18) and controls (N = 6). Comparisons were done between the control group and overall patients, CP extension (localized and generalized), and degree of disease severity (light, moderate, and severe); between CP extension (localized x generalized) and light degree x moderate and severe degree. The results are shown as mean ± SEM. Student's t-test was used; P ≤ 0.05 was considered significant.
