Table 1 Clinical parameters and bacterial levels at baseline in the patients with stable CP and progressive CP

Gender (male/female)

23/39

26/36

0.199

Age (year)

60.0 (56.0–66.0)

61 (52.5–68.0)

0.193

Smoking (non-smoker/smoker)

59/3

61/1

0.619

PlI

0.12 (0.06–0.30)

0.17 (0.07–0.45)

0.291

BOP (% positive)

3.62 (1.53–11.28)

6.54 (2.48–10.45)

0.022*

PPD (mm)

2.15 (1.80–2.53)

2.26 (1.76–2.57)

0.885

The deepest PPD (mm)

4.0 (4.00–6.00)

5.0 (4.25–7.75)

<0.001*

CAL (mm)

2.8 (2.34–3.33)

2.87 (2.78–3.62)

0.710

The deepest CAL (mm)

7.00 (5.25–8.00)

7.5 (6.25–9.00)

0.042*

P. gingivalis counts (log₁₀) Subgingival plaque

1.00 (1.00–3.17)

1.64 (1.00–4.29)

<0.001*

P. gingivalis counts (log₁₀) Saliva

2.59 (1.00–3.66)

3.34 (2.67–4.08)

0.002*

P. gingivalis IgG titers (EU)

1.28 (0.32–4.26)

1.63 (0.95–6.34)

0.503

P. intermedia counts (log₁₀) Subgingival plaque

1.00 (1.00–1.63)

1.00 (1.00–2.72)

0.049*

P. intermedia counts (log₁₀) Saliva

1.87 (1.00–3.65)

3.02 (1.41–4.05)

0.038*

P. intermedia IgG titers (EU)

−0.39 (0.47–0.13)

−0.27 (0.45–0.21)

0.173

A. actinomycetemcomitans counts (log₁₀) Subgingival plaque

1.00 (1.00–1.00)

1.00 (1.00–1.00)

0.164

A. actinomycetemcomitans counts (log₁₀) Saliva

1.00 (1.00–1.00)

1.00 (1.00–1.50)

0.065

A. actinomycetemcomitans IgG titers (EU)

−0.26 (0.41–0.03)

−0.30 (0.40–0.10)

0.278