Table 3. Presence of A. actinomyctemcomitans (Aa) with different serotypes, cdt-genotype and disease progression.

	OR	95% CI	p-value	Total number	Individuals (%) with progression of AL ≥3 mm
Aa -pos	5.126	2.994–8.779	<0.001	148	63 (42.6)
Aa-serotype a	6.917	2.869–16.673	<0.001	26	13 (50.0)
Aa-serotype b	7.685	2.835–20.830	<0.001	19	10 (52.6)
Aa-serotype c	3.365	1.659–6.826	<0.001	55	18 (32.7)
Aa-Cdt-pos	5.237	3.000–9.143	<0.001	123	53 (43.1)
Aa-Cdt-neg	4.611	1.861–11.426	= 0.001	25	10 (40.0)
Aa -neg *	1.000	reference	–	190	24 (12.6)

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.