UCHL1 and brain injury: Athletes with concussion had significantly lower UCH-L1 levels at the asymptomatic time point compared with baseline (mean difference, −0.321 pg/mL; 95% CI, −0.546 to −0.095 pg/mL; P < .001) and compared with non–contact sport controls (concussed vs non–contact sport controls: mean difference, −0.373 pg/mL; 95% CI, −0.714 to −0.032 pg/mL; P = .03).