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Table 2 Subgroup analyses by subtypes of human papillomavirus

From: Human papillomavirus infection and risk of breast cancer: a meta-analysis of case-control studies

Types

Sub-group

 

Numbers

I-squared (%)

SOR with 95 % CI by REM

Any

  

22

44.7

4.02 [2.42–6.68]

 

Nationality of subjects

Far-East

10

16.4

2.60 [1.25–5.38]

  

Middle-East

5

66.4

7.04 [2.43–20.42]

  

America

5

59.2

4.23 [1.06–16.84]

  

Europe & Oceania

2

0.0

4.39 [1.77–10.86]

 

Specimen types

PET

15

45.4

5.60 [2.79–11.25]

  

FFT

7

47.5

2.61 [1.22–5.61]

 

Year of publication

−2010

9

0.0

5.10 [2.89–8.99]

  

2011-

13

60.1

3.55 [1.68–7.50]

16

  

11

32.5

5.67 [2.21–14.52]

 

Nationality of subjects

Far-East

3

0.0

12.37 [2.83–54.15]

  

Middle-East

4

0.0

7.87 [1.76–35.23]

  

America

4

54.3

3.58 [0.61–21.03]

 

Specimen types

PET

9

25.9

4.25 [1.57,11.54]

  

FFT

2

0.0

16.47 [2.94–92.18]

 

Year of publication

−2010

5

0.0

12.47 [3.73–41.71]

  

2011-

6

30.1

3.25 [0.97–10.87]

18

  

10

0.0

2.97 [1.64–5.38]

 

Nationality of subjects

Far-East

3

0.0

1.54 [0.26–9.20]

  

Middle-East

4

52.5

3.37 [0.70–16.22]

  

America

3

0.0

4.50 [1.89–10.68]

 

Specimen types

PET

7

28.0

3.13 [1.09–9.03]

  

FFT

3

0.0

3.70 [1.54–8.88]

 

Year of publication

−2010

4

12.4

1.59 [0.51–4.96]

  

2011-

6

0.0

4.62 [2.17–9.81]

33

  

5

0.0

3.64 [1.26–10.48]

 

Nationality of subjects

Far-East

2

69.6

2.10 [0.06–68.51]

  

Middle-East

3

0.0

3.70 [0.98–13.90]

 

Specimen types

PET

5

0.0

3.64 [1.26–10.48]

  

FFT

-

-

-

 

Year of publication

−2010

3

40.4

2.64 [0.44–15.76]

  

2011-

2

0.0

4.88 [0.87–27.56]

  1. CIconfidence intervals, FFT fresh frozen tissue, PET paraffin-embedded tissue, REM random effect model