Probability of HPV16 or HPV18 positivity at month 6, 12, 18, or 24 visits among women with values of 25 (solid line), 50 (dashed line), or 75 (dot line) percentile of log10-transformed baseline HPV16 (log10 viral loads of 2.1, 2.9 and 3.7, respectively) or HPV18 DNA load (log10 viral loads of 3.1, 3.9, 5.0, respectively)