title: Risk markers for disappearance of pediatric Web resources.
abstract: OBJECTIVE
  The authors sought to find out whether certain Webometric indexes of a sample of pediatric Web resources, and some tests based on them, could be helpful predictors of their disappearance.
  
  
  METHODS
  The authors performed a retrospective study of a sample of 363 pediatric Websites and pages they had followed for 4 years. Main measurements included: number of resources that disappeared, number of inbound links and their annual increment, average daily visits to the resources in the sample, sample compliance with the quality criteria of 3 international organizations, and online time of the Web resources.
  
  
  RESULTS
  On average, 11% of the sample disappeared annually. However, 13% of these were available again at the end of follow up. Disappearing and surviving Websites did not show differences in the variables studied. However, surviving Web pages had a higher number of inbound links and higher annual increment in inbound links. Similarly, Web pages that survived showed higher compliance with recognized sets of quality criteria than those that disappeared. A subset of 14 quality criteria whose compliance accounted for 90% of the probability of online permanence was identified. Finally, a progressive increment of inbound links was found to be a marker of good prognosis, showing high specificity and positive predictive value (88% and 94%, respectively).
  
  
  CONCLUSIONS
  The number of inbound links and annual increment of inbound links could be useful markers of the permanence probability for pediatric Web pages. Strategies that assure the Web editors' awareness of their Web resources' popularity could stimulate them to improve the quality of their Websites.
authors.affiliation: Pediatric and Neonatal Intensive Care Unit, Department of Pediatrics, Hospital Universitario de Canarias, Tenerife. borges@teide.net
authors.forename: Angel A
authors.initials: AA
authors.lastname: Hernández-Borges
authors.forename: Alejandro
authors.initials: A
authors.lastname: Jiménez-Sosa
authors.forename: Maria L
authors.initials: ML
authors.lastname: Torres-Alvarez de Arcaya
authors.forename: Pablo
authors.initials: P
authors.lastname: Macías-Cervi
authors.forename: Maria A
authors.initials: MA
authors.lastname: Gaspar-Guardado
authors.forename: Ana
authors.initials: A
authors.lastname: Ruíz-Rabaza
mesh_terms: D006801:Humans; D007255:Information Services / Q000592:standards / Q000706:statistics & numerical data*; D016247:Information Storage and Retrieval / Q000592:standards / Q000706:statistics & numerical data*; D020407:Internet / Q000592:standards / Q000706:statistics & numerical data*; D010353:Patient Education as Topic / Q000592:standards*; D010372:Pediatrics / Q000592:standards*; D011785:Quality Assurance, Health Care / Q000706:statistics & numerical data; D012372:ROC Curve; D012189:Retrospective Studies