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Table 1 Number of included studies by type of cancer

From: Prevalence of human papillomavirus in head and neck cancers in European populations: a meta-analysis

Cancer

Number of included studiesa

Base of tongue

5

Hypopharyngeal

5

Laryngeal

10

Oral

18

Oropharyngeal

14

Paranasal sinus

1

Pharyngeal

4

Tongue

4

Tonsillar

13

Waldeyer’s ring

2

Unclassifiable

6

  1. aSome of the articles reported more than one type of cancer and presented the data for each type separately, allowing the data for each type to be regarded as a separate study. As such, the total number of articles based on classification by cancer type does not equal the total number of included studies in the systematic review and meta-analysis.
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BMC Cancer

ISSN: 1471-2407

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