title: Assessing measurement error in Medicare coverage from the National Health Interview Survey.
abstract: OBJECTIVE
  Using linked administrative data, to validate Medicare coverage estimates among adults aged 65 or older from the National Health Interview Survey (NHIS), and to assess the impact of a recently added Medicare probe question on the validity of these estimates.
  
  
  METHODS
  Linked 2005 NHIS and Master Beneficiary Record and Payment History Update System files from the Social Security Administration (SSA).
  
  
  METHODS
  We compared Medicare coverage reported on NHIS with "benchmark" benefit records from SSA.
  
  
  RESULTS
  With the addition of the probe question, more reports of coverage were captured, and the agreement between the NHIS-reported coverage and SSA records increased from 88% to 95%. Few additional overreports were observed.
  
  
  CONCLUSIONS
  Increased accuracy of the Medicare coverage status of NHIS participants was achieved with the Medicare probe question. Though some misclassification remains, data users interested in Medicare coverage as an outcome or correlate can use this survey measure with confidence.
authors.affiliation: National Center for Health Statistics.
authors.forename: Renee
authors.initials: R
authors.lastname: Gindi
authors.affiliation: National Center for Health Statistics.
authors.forename: Robin A
authors.initials: RA
authors.lastname: Cohen
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D019538:Health Care Surveys / Q000592:standards / Q000706:statistics & numerical data; D006801:Humans; D019458:Insurance Coverage / Q000706:statistics & numerical data; D007407:Interviews as Topic; D008297:Male; D006278:Medicare / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D014481:United States / Q000453:epidemiology
keywords: Medicare; National Center for Health Statistics; National Health Interview Survey; administrative data; measurement