Fig. 1From: Endogenous oestradiol and progesterone as predictors of oncogenic human papillomavirus (HPV) persistenceBaseline oestradiol levels in high-risk human papillomavirus (HR-HPV) negative (n = 17) vs. positive cases (n = 22). Morning oestradiol refers to the sample collected immediately upon awakening whereas daily oestradiol represents the mean of the 11 am, 2 pm, and 5 pm samples; **p < .01, ***p < .001Back to article page