title: Epidemiologic intervention framework of a prehospital emergency medical service.
abstract: OBJECTIVE
  To describe and analyze the characteristics of prehospital medical assistance provided by the Madrid Municipal Emergency and Civil Rescue & Protection Service (SAMUR); and, based on the epidemiologic knowledge so gained, to prioritize public health intervention strategies.
  
  
  METHODS
  A retrospective cross-sectional analysis of all medical services performed by the SAMUR-Protección Civil in 2001 and 2002. Study variables included causes, response times, hour, day of the week, month, mobile resource, Municipal District, and pathology. For analysis purposes, the relevant data were linked to Access 97 via Open Database Connectivity. Statistical analysis was performed using the SPSS computer software package, with Spearman's correlation coefficient and analysis of variance. Values were deemed statistically significant at p < 0.05.
  
  
  RESULTS
  The study population comprised the 97,937 and 101,438 interventions undertaken in 2001 and 2002, respectively. Mean daily activity in 2002 involved 278 alerts (standard deviation: 46), 95% confidence interval: 273-282. Distributions of the interventions were similar for 2001 and 2002, with peak activity from 1 to 2 pm and 8 to 9 pm, and minimum activity from 6 to 7 am. Activity was at its most intense on Saturdays. The magnitude of the association between the two years by day of the week was 96% (p < 0.001). The Central Municipal District (Centro) triggered 17,875 emergency actions. The prevalent pathology was traumatologic, followed by cardiovascular.
  
  
  CONCLUSIONS
  Epidemiologic description enabled the characteristics of the prehospital assistance procedure to be comprehensively ascertained and quantified. False alarms assume special relevance due to their implications. Emergency medical alerts with a psychosocial component are on the increase, something that must be controlled.
authors.affiliation: Madrid Municipal Emergency and Civil Rescue & Protection Service (SAMUR), Madrid City Council, Spain. vargasrmi@munimadrid.es
authors.forename: Mariana Isabel Vargas
authors.initials: MI
authors.lastname: Román
authors.forename: Angel Gil
authors.initials: AG
authors.lastname: de Miguel
authors.forename: Pilar Carrasco
authors.initials: PC
authors.lastname: Garrido
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Medina
authors.forename: Alvarez Juan
authors.initials: AJ
authors.lastname: Carlos
authors.forename: Gómez
authors.initials: G
authors.lastname: Díaz
authors.forename: Ervigio Corral
authors.initials: EC
authors.lastname: Torres
mesh_terms: D000552:Ambulances / Q000145:classification* / Q000706:statistics & numerical data; D002910:Chronology as Topic; D003430:Cross-Sectional Studies; D004632:Emergency Medical Services / Q000458:organization & administration / Q000706:statistics & numerical data*; D005843:Geography; D006301:Health Services Needs and Demand / Q000706:statistics & numerical data; D006801:Humans; D011635:Public Health Administration; D012189:Retrospective Studies; D013030:Spain / Q000453:epidemiology; D013997:Time Factors; D019037:Urban Health Services / Q000458:organization & administration / Q000706:statistics & numerical data*