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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%