Table 3 Subgroup analysis of the association between H. pylori infection and Periodontal diseases occurrence by type of study based, population, methods of sampling and detect

Type of study based

Hospital Based

18

2.64 (1.94–3.59)

43.98

0.05

30.29

0.42

0.59

Community Based

7

2.29 (1.71–3.07)

66.41

0.03

14.25

Population

General Population

4

1.94 (1.49–2.54)

54.65

0.09

6.43

3.87

0.43

Chronic Periodontal

15

2.57 (1.93–3.43)

36.07

0.07

22.34

Gastric Patients

6

3.49 (1.89–6.44)

56.76

0.05

11.84

 H. pylori detection

Polymerase Chain Reaction (PCR)

13

2.47 (1.66–3.67)

48.01

0.04

22.14

2.65

0.27

Rapid Urease Test

10

2.80 (2.18–3.60)

22.85

0.14

13.43

Other (Serology or ELIZA)

2

1.74 (1.04–2.92)

83.09

0.02

5.92

Continents

Asia

19

2.60 (2.05–3.31)

47.43

0.01

37.22

4.11

0.13

America

4

2.72 (1.45–5.25)

68.14

0.06

7.28

Europe

2

1.14 (0.53–1.47)

0.00

0.47

0.53

Periodontal Disease detection

CPITN

1

1.29 (0.45–3.66)

0.00

-

0.00

28.55

0.00

Index of Greene and Vermillion

1

2.10 (1.03–4.28)

0.00

-

0.00

Not reported

6

3.59 (2.51–5.13)

0.00

0.62

3.54

Oral examination

3

4.90 (2.81–8.52)

49.35

0.14

3.95

Probing test and clinical attachment loss

8

1.43 (1.13–1.82)

76.78

0.00

30.14

Probing test, Plaque index, Bleeding index

2

2.57 (1.36–4.85)

0.00

0.96

0.00

Clinical attachment loss

Not Reported

13

3.17 (2.46–4.09)

42.70

0.09

14.98

26.75

0.00

Attachment loss (mm)

2

3.04 (1.81–5.08)

0.00

0.57

0.32

> 4 mm

2

1.24 (0.86–1.79)

0.00

0.45

0.44

> 3 mm

4

1.27 (0.87–1.85)

24.76

0.29

9.17

Pocket status

Not Reported

10

3.19 (2.43–4.18)

46.98

0.04

9.07

21.41

0.00

Pocket depth (mm)

2

3.04 (1.81–5.08)

0.00

0.32

0.75

> 5

2

1.54 (0.79–3.03)

0.00

0.48

0.50

> 3

3

1.29 (0.81–2.05)

79.88

0.00

14.99

> 4

4

1.44 (1.05–1.98)

12.73

3.44

0.33