Figure 4From: Impact of Genetic Polymorphisms on the Smoking-related Risk of Periodontal Disease: the Population-based Study SHIPPercent attachment loss ≥ 4 mm among smokers (filled circles) and non-smokers (open circles) separated according to their Fcγ-RIIIb genotypes NA1/NA1, NA1/NA2 or NA/2NA2. Kruskal-Wallis test results in p = 0.024 and p = 0.797 for smokers and non-smokers, respectively.Back to article page