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A: The percentage of successive normal cardiac interbeat intervals greater than each given interval (pNNx) versus the NN interval in normal control (n=59) and clozapine-treated schizophrenia (n=61) groups. B: The differences between the mean pNNx values of normal control subjects and those of schizophrenic patients and the corresponding p values. The most significant separation between the two groups is around x=5 msec.
