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. Author manuscript; available in PMC: 2016 May 1.
Published in final edited form as: Cancer J. 2015 May-Jun;21(3):138–146. doi: 10.1097/PPO.0000000000000115

Figure 2. HPV prevalence in OPSCC by region.

Figure 2

Scatterplots depicting the raw HPV prevalence values for each article within the three main regions analyzed: worldwide, North America and Europe. The relative size of each grey circle is dependent on the number of OPSCCs evaluated by the study. The year for each article represents the median year of sample collection. The blue line plot represents the mean values for HPV prevalence in OPSCC generated by our statistical model for each region across four different time frames: pre-1995, 1995—1999, 2000—2004, and 2005—present.