Table 1

Recall of each strategy across databases


Potentially relevant ("tested positive") records identified by each strategy
Recall: Potentially relevant records ("tested positive") as a percentage (number) of total initial yield

1)Thesaurus
3537
47.6% (3537/7420)
2)Free-text
3451
46.5% (3451/7420)
3)Broad-based
3912
52.7% (3912/7420)
Total initial yield (duplicates and non-human eliminated)
7420
-

Shaw et al. BMC Medical Research Methodology 2004 4:5   doi:10.1186/1471-2288-4-5