Evaluating the accuracy of transcribed computer-stored immunization data.
OBJECTIVE
To evaluate the accuracy of immunization records transcribed into a computer-based immunization tracking system and to assess factors that contribute to inaccurate or incomplete immunization record keeping.


METHODS
Computer-stored immunization records were analyzed for 2098 children up to 2 years of age at the time of their most recent well-child visit to the UCLA Children's Health Center over a 12-month period. For children whose immunizations were not up to date, the computer-stored records were analyzed for sources of inaccuracy by comparison with the handwritten records from which the computer-stored data were transcribed.


RESULTS
An underimmunization rate of 22.5% (472 of 2098) was observed based on analysis of the computer-stored records. Comparison of the computer-stored and handwritten records revealed an overall transcription error rate of at least 10.2%. In addition, 38.4% of these apparently underimmunized children had received unrecorded immunizations from providers outside UCLA. When transcription errors were corrected and other available sources of immunization data were taken into account, the estimated rate of underimmunization decreased from 22.5% to 10.9%.


CONCLUSIONS
Unavoidable inaccuracies can diminish the utility of the data recorded in an immunization tracking system. Some inaccuracies are related to the process of transcription, but failures to record and communicate immunization data consistently also contribute to the inaccuracy of computer-stored immunization records.
University of California Los Angeles Department of Pediatrics 90024-1752.
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R
Wilton
A J
AJ
Pennisi
D002662:Child Health Services / Q000706:statistics & numerical data; D003627:Data Interpretation, Statistical; D001330:Electronic Data Processing / Q000592:standards / Q000706:statistics & numerical data; D006801:Humans; D007114:Immunization / Q000706:statistics & numerical data*; D007223:Infant; D007231:Infant, Newborn; D015141:Los Angeles; D016347:Medical Records Systems, Computerized / Q000592:standards* / Q000706:statistics & numerical data; D010044:Outpatient Clinics, Hospital / Q000706:statistics & numerical data; D015203:Reproducibility of Results; D012189:Retrospective Studies