Table 3 Multiple logistic regression analysis for progression of chronic periodontitis

Gender (male/female)

0.62 (0.30–1.29)

0.200

1.06 (0.43–2.65)

Age (years)

1.02 (0.98–1.07)

0.271

1.03 (0.97–1.08)

PlI

2.15 (0.37–12.48)

0.393

0.88 (0.10–8.10)

BOP (% positive)

1.04 (1.00–1.08)

0.077

1.03 (0.98–1.08)

CAL (mm)

1.14 (0.69–1.87)

0.603

0.72 (0.33–1.58)

The deepest CAL (mm)

1.25 (1.01–1.54)

0.039*

1.35 (0.99–1.85)

P. gingivalis counts (log₁₀)

4.163 (1.913–9.06)

<0.001*

1.56 (1.03–2.34)

P. gingivalisIgG titers (EU)

1.01 (0.98–1.05)

0.422

1.01 (0.99–1.03)

P. intermedia counts (log₁₀)

2.022 (0.92–4.443)

0.080

0.99 (0.52–1.76)

P. intermedia IgG titers (EU)

1.45 (0.46–4.60)

0.531

2.04 (0.50–8.22)

A. actinomycetemcomitans counts (log₁₀)

4.207 (0.457–38.757)

0.205

44.70 (0.05–36,574)

A. actinomycetemcomitans IgG titers (EU)

0.78 (0.33–1.85)

0.581

0.52 (0.15–1.76)