title: Predictive value of simple clinical and laboratory variables for dengue hemorrhagic fever in adults.
abstract: BACKGROUND
  Singapore experienced its worst dengue outbreak in 30 years in 2004, with 9459 notified cases, of which 83% were hospitalized.
  
  
  OBJECTIVE
  To determine predictors of dengue hemorrhagic fever (DHF) upon first presentation to hospital to aid clinicians in determining need for admission.
  
  
  METHODS
  We conducted a retrospective cohort study on dengue patients in Tan Tock Seng Hospital, Singapore in 2004, with patients categorized into dengue fever (DF) and DHF. Demographic, clinical, and laboratory variables upon first presentation were compared to determine the likelihood of developing DHF.
  
  
  RESULTS
  There were 1973 dengue patients-118 (6.0%) were DHF, of which 82 (4.2%) developed DHF during hospitalization. From the multivariate analysis, patients with bleeding had an odds of developing DHF 237.6 times that of DF, a unit decrease in total protein (g/L) had an odds of 1.28 times, a unit increase in blood urea (mmol/L) had an odds of 1.31 times, and a unit decrease in lymphocyte proportion had an odds of 1.08 times. The model had a sensitivity of 97.6%, specificity of 60.2%, and may reduce 1118 (56.7%) dengue admissions.
  
  
  CONCLUSIONS
  A few easily available clinical and laboratory results may assist clinicians in determining dengue admissions.
authors.affiliation: Department of Clinical Epidemiology, Tan Tock Seng Hospital, Singapore. vernonljm@hotmail.com
authors.forename: Vernon J
authors.initials: VJ
authors.lastname: Lee
authors.forename: David C B
authors.initials: DC
authors.lastname: Lye
authors.forename: Yan
authors.initials: Y
authors.lastname: Sun
authors.forename: Gina
authors.initials: G
authors.lastname: Fernandez
authors.forename: Adrian
authors.initials: A
authors.lastname: Ong
authors.forename: Yee Sin
authors.initials: YS
authors.lastname: Leo
mesh_terms: D000328:Adult; D001798:Blood Proteins / Q000032:analysis; D015331:Cohort Studies; D003715:Dengue / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology; D005260:Female; D006470:Hemorrhage; D006801:Humans; D018655:Lymphocyte Count; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D012307:Risk Factors; D012680:Sensitivity and Specificity; D019595:Severe Dengue / Q000175:diagnosis* / Q000473:pathology / Q000503:physiopathology; D012846:Singapore; D014508:Urea / Q000097:blood
chemical_list: D001798:Blood Proteins; D014508:Urea