there mentions of semen and infertility or quality, I wonder did they sample same time every day they sampled? It’s known men can have more semen at some times more so then others and these teens may have done things (to put it nicely) that may have effected the samples (like when your doctor needs first urine of day but you already went at home prior to doctor appt, or doctor tells you to fast but you snitch before the blood test)
They would have collected more data but I heard they were short-staffed.