American Journal of Epidemiology, Vol 152, Issue 9 889-894, Copyright © 2000 by Oxford University Press
MM Koo and TE Rohan
The recent availability of World Wide Web-based directories has opened up a
new approach for tracing subjects in epidemiologic studies. The
completeness of two World Wide Web-based directories (Canada411 and
InfoSpace Canada) for subject tracing was evaluated by using a randomized
crossover design for 346 adults randomly selected from respondents in an
ongoing cohort study. About half (56.4%) of the subjects were successfully
located by using either Canada411 or InfoSpace. Of the 43.6% of the
subjects who could not be located using either directory, the majority
(73.5%) were female. Overall, there was no clear advantage of one directory
over the other. Although Canada411 could find significantly more subjects
than InfoSpace, the number of potential matches returned by Canada411 was
also higher, which meant that a longer list of potential matches had to be
examined before a true match could be found. One strategy to minimize the
number of potential matches per true match is to first search by InfoSpace
with the last name and first name, then by Canada411 with the last name and
first name, and finally by InfoSpace with the last name and first initial.
Internet-based searches represent a potentially useful approach to tracing
subjects in epidemiologic studies.
Use of World Wide Web-based directories for tracing subjects in epidemiologic studies [In Process Citation]
Department of Public Health Sciences, University of Toronto, Ontario, Canada.
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