A comparison of polydipsia prevalence among chronic psychiatric patients using three measurement approaches

Biological Psychiatry
J I TracyR C Josiassen

Abstract

Many previous prevalence studies of polydipsia (PD) have utilized single and often non-biologic measures. In this study we estimated prevalence using specific gravity of urine (SPGU), normalized diurnal weight gain (NDWG), and staff identification (staff ID). Agreement between these two biologic and one behavioral measure was assessed. A total of 572 psychiatric inpatients were assessed for SPGU and NDWG. Unit staff were asked to identify PD patients. Positive and negative PD groups were formed separately based on the SPGU, NDWG, and staff ID data. All three measures were collected on the same day. Prevalence data for the biologic measures varied. The estimate for PD by SPGU (< 1.009 cutoff) was higher (43.4% of sample) than that of NDWG (> 2.5%; 25.4%) or staff ID (21.4%). These prevalence rates did not change substantially after exclusion of medical causes of polyuria. Agreement, assessed by the kappa statistic, was uniformly low among the measures. Weak association between the measures reflects their multidetermined, nonspecific nature, and highlights the lack of a diagnostic standard in the field. The observed prevalence rates must be considered rough approximations. Associations between the measures and certain subject cha...Continue Reading

References

Jun 1, 1991·Journal of Clinical Psychopharmacology·H S LeeH Y Meltzer
Dec 1, 1989·The American Journal of Psychiatry·A B Koczapski, R C Millson
Oct 15, 1970·The Japanese Journal of Physiology·T Morimoto, K Shiraki
Jul 1, 1996·Biological Psychiatry·J de LeonG M Simpson
Jan 1, 1996·Schizophrenia Bulletin·C VergheseR C Josiassen

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Citations

Mar 13, 2002·The Australian and New Zealand Journal of Mental Health Nursing·I CollsL C Ward
Oct 30, 2007·Schizophrenia Research·Idilio GonzálezAlfredo de la Rubia
Oct 21, 2006·The Cochrane Database of Systematic Reviews·G Brookes, A G Ahmed

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