Another similar chart here (lower left quadrant):
In this case, the distribution of PSA values is shown for each GS; different study, much larger sample size (several hundred samples for each GS, except only 19 at 5+5). The same positive correlation value is evident (listed in the report as 0.3; weaker correlation than the previously posted small sample study) by observing the the continually increasing median values (heavier black lines in the center of each box) left-to-right with increasing GS. The range of values at each GS is, I think, interesting.
Men with high GS and low PSA are minimally in the bottom quartile of the distributions, and may be statistical outliers. In other words, most men with high GS also have high PSA.
Post Edited (Normal59) : 6/19/2018 3:31:29 PM (GMT-6)