We evaluated temporal stability and outcome predictors associated with
polydipsia-hyponatremia (PH). Severity of PH was measured on two occa
sions separated by al least 1 year in 25 chronic psychiatric inpatient
s (24 with schizophrenia). Three-quarters of the sample had clinically
evident PH on follow-up. Follow-up PH severity was significantly rela
ted to intake severity and hospitalization length. Our findings sugges
t that PH may be a persistent condition with specific outcome predicto
rs. (C) 1997 Elsevier Science B.V.