KLK3 and posterior cortical atrophy: A regression equation model was extracted based on two critical pieces of information: (1) the distribution of newly detected PCa cases in each age group of the 50s, 60s, 70s, and over 80s from a recent period (2006–2020), and (2) the PSA testing rate (PSAr) from the previous decade (2006–2016) for each age subgroup.