Presence of <i>A. actinomyctemcomitans</i> (<i>Aa</i>) with different serotypes, <i>cdt</i>-genotype and disease progression.

Odds ratio (OR) showing the association of progression of attachment loss (AL) ≥3 mm after a two-year follow-up period in relation to the carrier status of Aa. OR, odds ratio; CI, confidence interval; AL, attachment loss. Significance (p<0.05). *The reference group. Reference is the progression of AL in individuals that were Aa-negative.