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Table 1 Characteristics of included studies.

From: Optimizing search strategies to identify randomized controlled trials in MEDLINE

  n (total = 61) %
Year of publication or substantive update   
   Median 2001  
   Interquartile range 1999–2001  
Focus of the review   
   Treatment 52 85.2
   Prevention 7 11.5
   Diagnosis 1 1.6
   Other 1 1.6
Study designs included   
   RCT only 33 54.1
   RCT and quasiRCT 24 39.3
   RCT and other controlled trials 4 6.6
Number of included studies per review   
   Median 12  
   Interquartile range 5.5–19.5  
Review Group   
   Musculoskeletal Injuries 13 21.3
   Eyes and Vision 11 18.0
   Renal 6 9.8
   Prostatic Diseases and Urologic Cancers 5 8.2
   Back 4 6.6
   Upper Gastrointestinal and Pancreatic Diseases 3 4.9
   Skin 3 4.9
   Other 16 30.0