Fig. 5From: Association among serum and salivary A. actinomycetemcomitans specific immunoglobulin antibodies and periodontitisAnalysis of periodontal parameters according to A. actinomycetemcomitans IgG quartiles and P-trend. Each P-trend value, referred to an increase/decrease of periodontal parameters according to A. actinomycetemcomitans IgG quartiles and was obtained by means of the Jonckheere-Terpstra test for the ordered alternative hypothesisBack to article page