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Table 5 Calculation of probability of acceptable recall of a PubMed sample of systematic reviews

From: Optimal database combinations for literature searches in systematic reviews: a prospective exploratory study

  Frequency Frequency percentage (a) (%) Probability recall > 95% (b) (%) a × b (%) Probability recall 100% (c) (%) c × b (%)
EM-ML 73 37 47 17 24 9
ML 41 21 16 3 9 2
EM-ML-WoS 40 20 64 13 36 7
ML-WoS 21 11 21 2 16 2
ML-GS 7 4 26 1 16 1
ML-WoS-GS 7 4 37 1 29 1
EM-ML-GS 5 3 76 2 41 1
EM 2 1 19 0 14 0
EM-WoS 1 1 40 0 28 0
WoS 1 1 7 0 7 0
Total 198a 100   40   23
  1. aTwo reviews did not use any of the databases used in this evaluation