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Figure 1. Clinical data of the study population (n=413). Box plots represent the distribution in quartiles of mean % of sites with probing pocket depth (PPD) of 5-6 mm; PPD >6 mm; clinical attachment level (CAL) of 4-5 mm; CAL >5 mm; visible supragingival plaque (PL), marginal gingival bleeding (GI), bleeding on probing (BOP) and calculus (CA). Whiskers indicate minimum and maximum values; circles indicate outliers. All parameters differed significantly among groups (Kruskal-Wallis test, p<0.05). *Refers to significant differences between periodontal health and gingivitis; #between gingivitis and periodontitis and $between periodontal health and periodontitis groups (Mann-Whitney test, p<0.05).