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Table 2 Percentage of records filtered out

From: Development and validation of a search filter to identify equity-focused studies: reducing the number needed to screen

 

MEDLINE

Embase

No. of records in databasea

No. retrieved

% filtered out

No. of records in databasea

No. retrieved

% filtered out

Specific terms

24 442 442

1 598 431

93.5

31 237 516

2 233 531

92.8

Non-specific terms

24 442 442

1 532 739

93.7

31 237 516

1 734 459

94.4

Combined strategyb

24 442 442

2 764 686

88.7

31 237 516

3 515 240

88.7

  1. aestimated using the search strategy ‘a*.mp.’
  2. bThe specific terms and non-specific terms strategies combined with Boolean ‘OR’