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. 2010 Nov 11;10:326. doi: 10.1186/1471-2334-10-326

Figure 3.

Figure 3

Cumulative positivity rate for infections with HPV types 16, 18, 31, and 45 according to tertiles of cumulative viral load for these 4 types. Unit of analysis is an individual infection episode, which makes observations not independent as a subject may contribute multiple episodes. Dotted line: upper tertile; dashed line: middle; solid line: lower tertile viral load.