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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.