title: Creating a nationally representative sample of patients from trauma centers.
abstract: BACKGROUND
  The National Trauma Data Bank (NTDB) was developed as a convenience sample of registry data from contributing trauma centers (TCs), thus, inferences about trauma patients may not be valid at the national level. The NTDB National Sample was created to obtain nationally representative estimates of trauma patients treated in the US level I and II TCs.
  
  
  METHODS
  Level I and II TCs in the Trauma Information Exchange Program were identified and a random stratified sample of 100 TCs was selected. The probability-proportional-to-size method was used to select TCs and sample weights were calculated. National Sample Program estimates from 2003 to 2006 were compared with raw NTDB data, and to a subset of TCs in the Healthcare Cost and Utilization Project Nationwide Inpatient Sample, a population-based dataset drawn from community hospitals.
  
  
  RESULTS
  Weighted estimates from the NTDB National Sample range from 484,000 (2004) to 608,000 (2006) trauma incidents. Crude NTDB data over-represented the proportion of younger patients (0 years-14 years) compared with the NTDB National Sample, which does not include children's hospitals. Few TCs in Trauma Information Exchange Program are included in Healthcare Cost and Utilization Project Nationwide Inpatient Sample, but estimates based on this subset indicate a higher percentage of older patients (age 65 year or older, 23.98% versus 17.85%), lower percentage male patients, and a lower percentage of motor vehicle accidents compared with NTDB National Sample.
  
  
  CONCLUSIONS
  Although nationally representative data regarding trauma patients are available in other population-based samples, they do not represent TCs patients and lack the specificity of National Sample Program data, which contains detailed information on injury mechanisms, diagnoses, and hospital treatment.
authors.affiliation: American College of Surgeons, Committee on Trauma, Chicago, Illinois, USA.
authors.forename: Sandra
authors.initials: S
authors.lastname: Goble
authors.forename: Melanie
authors.initials: M
authors.lastname: Neal
authors.forename: David E
authors.initials: DE
authors.lastname: Clark
authors.forename: Avery B
authors.initials: AB
authors.lastname: Nathens
authors.forename: J Lee
authors.initials: JL
authors.lastname: Annest
authors.forename: Mark
authors.initials: M
authors.lastname: Faul
authors.forename: Richard W
authors.initials: RW
authors.lastname: Sattin
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.forename: Paul S
authors.initials: PS
authors.lastname: Levy
authors.forename: N Clay
authors.initials: NC
authors.lastname: Mann
authors.forename: Karen
authors.initials: K
authors.lastname: Guice
authors.forename: Laura D
authors.initials: LD
authors.lastname: Cassidy
authors.forename: John J
authors.initials: JJ
authors.lastname: Fildes
mesh_terms: D000059:Accidents / Q000706:statistics & numerical data; D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D015601:Injury Severity Score; D008297:Male; D008875:Middle Aged; D012042:Registries; D015203:Reproducibility of Results; D012307:Risk Factors; D018401:Sample Size; D017678:Sex Distribution; D014193:Trauma Centers / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology; D014947:Wounds and Injuries / Q000453:epidemiology*; D055815:Young Adult