Fig. 1From: Association of PSA variability with prostate cancer development using large-scale medical information data: a retrospective cohort studyStudy designNote: 1-PSA, PSA value that exists for the first time in the database; 2-PSA, PSA value measured for the first time within three months or more and two years after 1-PSAThe PSA measurements “×” were not adopted because they met the exclusion criteriaBack to article page