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Table 3 Precision of each search strategy.

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

Search strategy Median (%) Interquartile range (%) Mean rank (Friedman test) Reviews with precision < 1% (%) Total retrieval size (across 61 reviews)
SS123 0.54 1.87 1.02 59.02 508625
SS12 1.68 5.55 5.17 34.43 151691
SScrossover 1.68 5.54 4.24 34.43 152662
SSCROSS-OVERSTUDIES 1.68 5.55 4.77 34.43 151844
SSvolunteer 1.68 5.51 3.52 34.43 152880
SSversus 1.48 5.04 2.29 36.07 171032
  1. χ2 = 258.634, p < .01