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A cutoff value based on analysis of a reference population decreases overestimation of the prevalence of nocturnal polyuria.
J Urol. 2012 Sep; 188(3):869-73.JU

Abstract

PURPOSE

We sought criteria for nocturnal polyuria in asymptomatic, nonurological adults of all ages by reporting reference values of the ratio of daytime and nighttime urine volumes, and finding nocturia predictors.

MATERIALS AND METHODS

Data from a database of frequency-volume charts from a reference population of 894 nonurological, asymptomatic volunteers of all age groups were analyzed. The nocturnal polyuria index and the nocturia index were calculated and factors influencing these values were determined by multivariate analysis.

RESULTS

The nocturnal polyuria index had wide variation but a normal distribution with a mean ± SD of 30% ± 12%. The 95th percentile of the values was 53%. Above this cutoff a patient had nocturnal polyuria. This value contrasts with the International Continence Society definition of 33% but agrees with several other reports. On multivariate regression analysis with the nocturnal polyuria index as the dependent variable sleeping time, maximum voided volume and age were the covariates. However, the increase in the nocturnal polyuria index by age was small. Excluding polyuria and nocturia from analysis did not alter the results in a relevant way. The nocturnal voiding frequency depended on sleeping time and maximum voided volume but most of all on the nocturia index.

CONCLUSIONS

The prevalence of nocturnal polyuria is overestimated. We suggest a new cutoff value for the nocturnal polyuria index, that is nocturnal polyuria exists when the nocturnal polyuria index exceeds 53%. The nocturia index is the best predictor of nocturia.

Authors+Show Affiliations

Department of Urology, Sint Lucas Andreas Ziekenhuis, Amsterdam, The Netherlands. e.vanhaarst@slaz.nlNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22819414

Citation

van Haarst, Ernst P., and J L H Ruud Bosch. "A Cutoff Value Based On Analysis of a Reference Population Decreases Overestimation of the Prevalence of Nocturnal Polyuria." The Journal of Urology, vol. 188, no. 3, 2012, pp. 869-73.
van Haarst EP, Bosch JL. A cutoff value based on analysis of a reference population decreases overestimation of the prevalence of nocturnal polyuria. J Urol. 2012;188(3):869-73.
van Haarst, E. P., & Bosch, J. L. (2012). A cutoff value based on analysis of a reference population decreases overestimation of the prevalence of nocturnal polyuria. The Journal of Urology, 188(3), 869-73. https://doi.org/10.1016/j.juro.2012.04.112
van Haarst EP, Bosch JL. A Cutoff Value Based On Analysis of a Reference Population Decreases Overestimation of the Prevalence of Nocturnal Polyuria. J Urol. 2012;188(3):869-73. PubMed PMID: 22819414.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A cutoff value based on analysis of a reference population decreases overestimation of the prevalence of nocturnal polyuria. AU - van Haarst,Ernst P, AU - Bosch,J L H Ruud, Y1 - 2012/07/20/ PY - 2011/12/29/received PY - 2012/7/24/entrez PY - 2012/7/24/pubmed PY - 2012/10/30/medline SP - 869 EP - 73 JF - The Journal of urology JO - J. Urol. VL - 188 IS - 3 N2 - PURPOSE: We sought criteria for nocturnal polyuria in asymptomatic, nonurological adults of all ages by reporting reference values of the ratio of daytime and nighttime urine volumes, and finding nocturia predictors. MATERIALS AND METHODS: Data from a database of frequency-volume charts from a reference population of 894 nonurological, asymptomatic volunteers of all age groups were analyzed. The nocturnal polyuria index and the nocturia index were calculated and factors influencing these values were determined by multivariate analysis. RESULTS: The nocturnal polyuria index had wide variation but a normal distribution with a mean ± SD of 30% ± 12%. The 95th percentile of the values was 53%. Above this cutoff a patient had nocturnal polyuria. This value contrasts with the International Continence Society definition of 33% but agrees with several other reports. On multivariate regression analysis with the nocturnal polyuria index as the dependent variable sleeping time, maximum voided volume and age were the covariates. However, the increase in the nocturnal polyuria index by age was small. Excluding polyuria and nocturia from analysis did not alter the results in a relevant way. The nocturnal voiding frequency depended on sleeping time and maximum voided volume but most of all on the nocturia index. CONCLUSIONS: The prevalence of nocturnal polyuria is overestimated. We suggest a new cutoff value for the nocturnal polyuria index, that is nocturnal polyuria exists when the nocturnal polyuria index exceeds 53%. The nocturia index is the best predictor of nocturia. SN - 1527-3792 UR - https://www.unboundmedicine.com/medline/citation/22819414/A_cutoff_value_based_on_analysis_of_a_reference_population_decreases_overestimation_of_the_prevalence_of_nocturnal_polyuria_ L2 - https://www.jurology.com/doi/full/10.1016/j.juro.2012.04.112?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -