Fig. 6. Percentage of reduction of NBT (nitro blue tetrazolium) test by peripheral blood leukocytes from individuals in the control (C, n.16), periodontitis (P, n.14), diabetes (DM, n.11) and periodontitis + diabetes (DMP, n.17) groups. The results showed that both basal (Kruskal-Wallis test) and S. cerevisiae-stimulated (ANOVA) production did not differ between groups. The medians, quartiles and extreme values are shown from a single experiment, representative of two independent experiments, from 58 samples. The experiments were performed in duplicate. p < 0.05.