Serum IL-1β was slightly higher in nonobese OSA group, but with statistical significance, than in nonobese non-OSA group (19.39 ± 4.67 vs 17.25 ± 3.66 ng/L, P = .041), than in obese non-OSA group (19.39 ± 4.67 vs 17.42 ± 3.79 ng/L, P = .047), and than in obese OSA group (19.39 ± 4.67 vs 17.53 ± 3.55 ng/L, P = .049), whereas other biomarkers, IL-6 and TNF-a did not show significant differences among groups. This evidence concerns the gene IL1B and obstructive sleep apnea syndrome.