A sample of 1,671 patients in a long-term psychiatric inpatient hospital were polled for hand preference in writing. Nonright-handers (n = 420) were more often diagnosed schizophrenic than Right-handers (n 1,251), but the overall proportion of psychotic illness was the same in both handedness groups, suggesting the possibility that nonright-handedness may be associated with a change in the expression of psychotic illness so it is somewhat more likely to be manifest as thought disorder than mood disorder.
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