IL6 and chronic obstructive pulmonary disease: Similarly, no significant differences were found between the concentration of IL6 in saliva with each of the following common comorbidities: arterial hypertension (p = 0.51, Mann–Whitney U test), diabetes (p = 0.76, Mann–Whitney U test), chronic obstructive pulmonary disease (p = 0.97, Mann–Whitney U test), dyslipidemia (p = 0.96, Mann–Whitney U test), anxiety (p = 0.13, Mann–Whitney U test) and depression (p = 0.10, Mann–Whitney U test).