title: [Design of a simple score to predict the etiology of pneumonia in children].
abstract: BACKGROUND
  The etiology of pneumonia is important to indicate antibiotics. A clinical prediction score (RP) has been designed, although the radiological interpretation is not easy.
  
  
  OBJECTIVE
  To design a simple prediction score (PRs) to identify etiology in children with pneumonia, including radiological patterns, clinical and laboratory features.
  
  
  METHODS
  Cross sectional study. We prospectively included children under 5 years hospitalized for pneumonia with microbiological evidence (2007-2008). According to the RP, were allocated 3 points when the temperature value was ≥ 39 º C, 2 when the patient age was ≥ 9 months, 2 when the number of neutrophils was 8000/mm3 and 1 when the immature neutrophils number was ≥ 5%. Radiography was evaluated as one point when consolidation was diagnosed and 0 point when pleural effusion or other infiltrations were present. RPS range was from 0 to 9 points. We determined the best cutoff for predicting bacterial pneumonia (ROC) and was calculated based on the same sensitivity (S), specificity (Sp), positive predictive value (PPV) and negative (NPV) and positive likelihood ratio ( RVP) and negative (NLR).
  
  
  RESULTS
  196 patients (viral: 82%, bacteria: 18%), 8.7 ± 10 months. We identified a score ≥ 3 (auROCc = 0.87 95% CI 0.81 to 0.94) as the best point to predict bacterial pneumonia (S: 88.6%, E: 68.9%, PPV: 38.3 %, NPV: 96.5% RVP: 2.85; RPN: 0.17).
  
  
  CONCLUSIONS
  The PRs showed an acceptable performance, but less sensitive than the original score to predict bacterial pneumonia. Although this tool may be easily applied, it should be validated in future studies.
authors.affiliation: Servicio de Pediatría y Neonatologia, Hospital Privado Centro Médico de Córdoba, Argentina.
authors.forename: Laura B
authors.initials: LB
authors.lastname: Moreno
authors.forename: Fernando
authors.initials: F
authors.lastname: Ferrero
authors.forename: Valeria
authors.initials: V
authors.lastname: Collard Brosotti
authors.forename: Jorge
authors.initials: J
authors.lastname: Camara
authors.forename: Inés
authors.initials: I
authors.lastname: Marques
authors.forename: Hugo
authors.initials: H
authors.lastname: Robledo
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Bujedo
authors.forename: Liliana
authors.initials: L
authors.lastname: Mosca
authors.forename: Daniel
authors.initials: D
authors.lastname: Quiroga
mesh_terms: D001118:Argentina / Q000453:epidemiology; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D006760:Hospitalization; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D018410:Pneumonia, Bacterial / Q000175:diagnosis* / Q000453:epidemiology; D011024:Pneumonia, Viral / Q000175:diagnosis* / Q000453:epidemiology; D011237:Predictive Value of Tests; D015995:Prevalence; D012621:Seasons