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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2010 Aug;19(8):2055–2065. doi: 10.1158/1055-9965.EPI-10-0394

Figure 3. Time to acquisition of a 2nd and 3rd event with HPV by number of HPV types and history of persistence vs. clearance.

Figure 3

Clear refers to those who clear their HPV types from the 1st event prior to 2nd event (A) or 2nd to 3rd event (B). Persist refers to those with a persistent HPV type from 1st event to the 2nd event (A) or 2nd to 3rd event (B). 1, 2, 3, and greater than 4 refers to number of types at the 1st and 2nd event in figures A and B, respectively.