RT Journal
A1 Leslie WD, O’Donnell S
T1 DAtabase validity in assessing population trends in hip fracture rates in canada—reply
JF JAMA
JO JAMA
YR 2010
FD January 13
VO 303
IS 2
SP 134
OP 135
DO 10.1001/jama.2009.1974
UL http://dx.doi.org/10.1001/jama.2009.1974
AB 
Various methods for internal and external validation of the accuracy of administrative data sources have therefore been proposed.1- 4 In the case of the HMDB, more attention has been placed on verification of recent data holdings than on earlier data.5 This could introduce biases over time, although the magnitude is unlikely to account for the findings in our study. A low level of discrepancies for hip fractures (6.0%) was identified in the Discharge Abstract Database Data Quality Re-abstraction Study for 1999-2000 and 2000-2001.6 Although this national study did not address earlier data years, a provincial subset with linkable data sources permitted direct comparison of hip fracture rates from most responsible hospital diagnosis, hospital procedures, and surgical billing from 1986 to 2007. There was good overall agreement (within 10%) without any major systematic change over time.