Table 1 Comparison of the characteristics and isolation rates of P. gingivalis between the two groups

Age/year

43.1 ± 6.2

44.9 ± 6.3

0.06^a

  SES-1

23(25.6)

21(23.3)

  SES-2

27(30.0)

26(28.9)

  SES-3

18(20.0)

23(25.6)

  SES-4

6(6.7)

13(14.4)

  SES-5

16(17.7)

7(7.8)

0.15^b

  High school and below

52(57.8)

38(42.2)

  Undergraduate

26(28.9)

34(37.8)

  Graduate and above

12(13.3)

18(20.0)

0.11^b

  Male

33 (36.7)

44 (48.9)

  Female

57 (63.3)

46 (51.1)

0.10^b

  Smoking (%)

8 (8.9)

16 (17.8)

0.08^b

  Alcohol consumption (%)

12 (13.3)

19 (21.1)

0.17^b

  Body mass index

22.5 ± 3.6

23.6 ± 4.2

0.06^a

  Chronic hypertension (%)

3 (3.3)

6 (6.7)

0.31^b

  Diagnosis of periodontitis (%)

31 (34.4)

48 (53.3)

0.01^b

  Plaque index

1.9 ± 0.6

2.0 ± 0.4

0.19^a

  Sites with BOP/%

31.4 ± 12.9

33.3 ± 14.4

0.35^a

  PPD - Full mouth/mm

2.0 ± 0.6

2.1 ± 0.5

0.23^a

  CAL - Full mouth/mm

1.8 ± 0.5

2.0 ± 0.4

0.004^a

  Fasting glucose/ (mmol/L)

4.86 ± 0.58

7.88 ± 1.60

< 0.001^a

  Fasting insulin/ (µU/mL)

9.22 ± 2.39

13.64 ± 4.09

< 0.001^a

  HOMA-IR

1.97 ± 0.49

4.65 ± 1.29

< 0.001^a

  Positive (%)

29 (32.2)

47 (52.2)

  Negative (%)

61 (67.8)

43 (47.8)

0.01^b,c