1. Severity of illness and the weekend mortality effect: a retrospective cohort study
- Author
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Eric Bressman, John Rowland, Beth G Raucher, and Vinh-Tung Nguyen
- Subjects
Adult ,Male ,medicine.medical_specialty ,Time Factors ,Wilcoxon signed-rank test ,Population ,education ,030204 cardiovascular system & hematology ,Logistic regression ,Risk Assessment ,Severity of Illness Index ,Severity of illness ,03 medical and health sciences ,0302 clinical medicine ,Patient Admission ,Medicine ,Humans ,030212 general & internal medicine ,Hospital Mortality ,Aged ,Retrospective Studies ,Weekend admission ,education.field_of_study ,Academic Medical Centers ,business.industry ,lcsh:Public aspects of medicine ,Health Policy ,Public health ,Mortality rate ,lcsh:RA1-1270 ,Retrospective cohort study ,Middle Aged ,United States ,Weekend mortality ,Patient level data ,Female ,business ,Demography ,Research Article - Abstract
BackgroundWeekend admission to the hospital has been found to be associated with higher in-hospital mortality rates, but the cause for this phenomenon remains controversial. US based studies have been limited in their characterization of the weekend patient population, making it difficult to draw conclusions about the implications of this effect.MethodsA retrospective cohort study, examining de-identified, patient level data from 2015 to 2017 at US academic medical centers submitting data to the Vizient database, comparing demographic and clinical risk profiles, as well as mortality, cost and length of stay, between weekend and weekday patient populations. Between-group differences in mortality were assessed using the chi-square test for categorical measures and Wilcoxon rank-sum test for continuous measures. Logistic regression models were used to test the multivariate association of weekend admission and other patient-level factors with death, LOS, etc.ResultsWe analyzed 10,365,605 adult inpatient encounters. Within the weekend patient population, 30.6% of patients were categorized as having either a major or extreme risk of mortality on admission, as compared to 23.7% on weekdays (p p p ConclusionThe patient population admitted on weekends is proportionally higher risk than the population admitted on weekdays, and the observed weekend mortality effect is largely attributable to this risk imbalance.
- Published
- 2020