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Table 2 Selected characteristics of the 34 studies

From: Meta-analysis of the impact of human papillomavirus (HPV) on cancer risk and overall survival in head and neck squamous cell carcinomas (HNSCC)

  

N

%

Confounding factors

Age

22

64.71%

 

Gender

24

70.59%

 

Smoking

15

44.12%

 

Alcohol

15

44.12%

Study type

Case-control

6

17.65%

 

Nested Case Control

1

2.94%

 

Multi-Center Case Control

1

2.94%

 

Case Series

3

8.82%

 

Retrospective

20

58.82%

 

Prospective

3

8.82%

Sample size

< 50

5

14.71%

(No. of patients)

50-99

14

41.18%

 

100-149

7

20.59%

 

>150

8

23.53%

Prevalence HPV

< 25%

14

41.18%

 

25%-50%

14

41.18%

 

50%-75%

5

14.71%

 

>75%

1

2.94%

Prevalence HPV-16

< 25%

16

47.06%

 

25%-50%

13

38.24%

 

50%-75%

4

11.76%

 

>75%

1

2.94%

Method of Detection

PCR

33

97.06%

 

FISH

1

2.94%

Country

USA

14

41.18%

 

Canada

1

2.94%

 

Puerto Rico

1

2.94%

 

France

2

5.88%

 

Germany

4

11.76%

 

Netherlands

2

5.88%

 

Italy

3

8.82%

 

Switzerland

1

2.94%

 

Norway, Finland, Sweden

1

2.94%

 

Sweden

3

8.82%

 

Japan

1

2.94%

 

International

1

2.94%