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Table 4 Records identified by each of the bibliographic databases and citation tracking resources

From: Citation searching: a systematic review case study of multiple risk behaviour interventions

Database Total records identified Total included studies available Included studies retrieved Recall % (n = 40) Precision % Number needed to read (NNR)
MEDLINE 8279 39 30 75% 0.36% 276
Embase 13176 38 25 62.5% 0.19% 527
PsycINFO 5475 29 21 52.5% 0.38% 261
SCI 7048 40 12 30% 0.17% 587
CENTRAL 1059 34 11 27.5% 1.04% 96
Google scholar 1680 38 8 20% 0.48% 210
Scopus 1173 39 8 20% 0.68% 147
Web of Science 1095 40 8 20% 0.73% 137
ASSIA 881 16 4 10% 0.45% 220
OVIDSP MEDLINE 213 39 2 5% 0.94% 107
Citation searching all sources 1789 40 9 22.5% 0.5% 199