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(A) Histograms of log-transformed summed key-Finger Force Manipulandum scores in patients with schizophrenia (blue vertical bars) and control subjects (orange bars). (B) Receiver-operating characteristic curve showing sensitivity and specificity of various criterion levels. Youden’s J statistic shows that the optimal value of 1.2 gives sensitivity = 0.79 and specificity = 0.9. Large area under curve (AUC = 0.91) suggests positive diagnostic interest of summed dexterity score.
