As shown in Figure 1, there were no statistically significant differences in expression of IL-17A between patients with periodontitis and control subjects (median: 0.00039, Q1–Q3: 0.000068–0.00088 vs. median: 0.00088, Q1–Q3: 0–0.0023, respectively, p = 0.81). This evidence concerns the gene IL17A and periodontitis.