Fig. 2

Receiver operating characteristic curve analyses of the RTS, ISS, QTP, STD, and the combination of QTP and STD for predicting 48-h mortality in patients with TBI. The AUCs of RTS, ISS, QTP, STD, and the combination of QTP and STD were 0.790 (95% CI, 0.764–0.815), 0.632 (95% CI, 0.602–0.662), 0.605 (95% CI, 0.574–0.635), 0.723 (95% CI, 0.695–0.750), and 0.786 (95% CI, 0.759–0.811), respectively. The AUC of the combination of QTP and STD was significantly different from that of ISS, STD, and QTP, but not RTS. RTS, revised trauma score; ISS, injury severity score; QTP, prolongation of corrected QT interval; STD, ST-segment depression; AUC, area under the curve; CI, confidence intervals