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Table 1 Results of the various types of searches

From: Effectiveness of different databases in identifying studies for systematic reviews: experience from the WHO systematic review of maternal morbidity and mortality

Source Number identified Number included Number unique included* Sensitivity (%) Precision (%)
   MEDLINE 38986 1590 400 61.6 4.1
   Popline 3255 297 91 11.5 9.1
   EMBASE 23133 1135 154 43.9 4.9
   CINAHL 9090 263 9 10.2 2.9
   CAB Abstracts 4317 190 19 7.4 4.4
   Econlit 188 4 1 0.2 2.1
   SocioFile 1618 32 8 1.2 2.0
   LILACS 1456 137 117 5.3 9.4
   BIOSIS 3313 436 21 16.9 13.2
   PAIS International 705 21 3 0.8 3.0
   IMEMR 109 11 5 0.4 10.1
All Electronic databases** 64098 2093 NA 81.1 3.3
Other § 487 487 487 18.9 NA
TOTAL ± 64585 2580 2580 NA 4.0
  1. * Refers to the number of citations that were exclusively identified by each database.
  2. ** Refers to all citations identified through the electronic databases above after duplicate entries are removed.
  3. § Includes hand searching, contacting experts, conference proceedings, reference lists, library collections of journals, and databases in developing countries.
  4. ± Refers to all citations identified through all methods after duplicate entries are removed. NA: Non-applicable