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Table 2 A summary of the included study characteristics

From: Bacterial biofilm prevalence in dental unit waterlines: a systematic review and meta-analysis

Year

Country

Author

Sample size

Number of positive samples

Pseudomonas Aeruginosa

Legionella pneumophila

Risk Score

Ref

ADA

CDC

C100

Sample No

Positive

Sample No

Positive

1976

USA

Gross A

57

38

33

     

2

[32]

1993

USA

Williams JF

182

 

131

     

3

[33]

2000

United Kingdom

Walker JT

110

91

 

104

    

7

[34]

2002

USA

Cobb CM

12

12

12

12

    

5

[35]

2003

Brazil

Souza-Gugelmin MC

30

26

26

27

    

4

[36]

2004

Spain

Araujo R

80

17

      

7

[37]

2004

European countries

Walker JT

474

242

  

474

18

474

5

8

[38]

2004

United Kingdom

Walker RJ

60

45

45

49

    

6

[39]

2008

Turkey

Goksay D

59

57

49

59

59

14

59

0

5

[40]

2009

Sweden

Dahlen G

405

283

263

302

405

0

405

61

4

[41]

2009

Iran

Nikaeen M

50

45

43

     

5

[42]

2009

Turkey

Turetgen I

123

112

      

6

[43]

2012

Italy

Pasquarella C

717

 

414

 

148

31

150

22

5

[44]

2012

Malaysia

Siang MM

75

21

  

75

9

75

0

4

[45]

2014

Iran

Dobaradaran S

260

260

 

260

    

9

[46]

2014

Turkey

Gungor ND

50

37

  

50

3

50

0

6

[47]

2014

Turkey

Kadaifciler DG

20

14

11

     

6

[48]

2014

Brazil

Libosa GM

18

18

16

     

4

[49]

2015

Italy

Leoni E

136

32

    

136

32

8

[50]

2018

India

Lal B

44

43

      

6

[51]

2018

China

Zhang Y

33

 

33

33

    

5

[52]

2019

Egypt

Gawish S

120

   

120

9

  

8

[15]

2019

China

Ji XY

611

 

268

320

    

9

[53]

2019

Italy

Spagnolo AM

30

  

30

  

60

47

7

[54]

2019

Netherlands

Volgenant C

214

  

59

    

5

[55]

2020

Ecuador/Venezuela

Castellano Realpe OJ

143

 

105

 

43

22

  

7

[56]