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Table 1 Description of test datasets sourced from AHRQ.

From: Boolean versus ranked querying for biomedical systematic reviews

  Drug Dataset Misc Dataset
Review Tier 0 Tier 1 Tier 2 Tier 0 Tier 1 Tier 2
1 2,544 183 41 616 38 12
2 851 84 20 1,733 273 92
3 310 92 16 32,308 421 198
4 1,120 363 146 4,949 413 83
5 2,072 302 42 10 508 104
6 1,218 279 100 505 130 34
7 368 80 80 1,261 1,103 440
8 393 88 41 14,935 796 65
9 1,915 48 15 10 329 21
10 503 139 136 243 535 121
11 1,333 238 51 1,235 2,329 365
12 1,643 34 9 682 158 77
13 3,465 173 85    
14 671 218 24    
15 327 78 40    
Avg. 1248.5 159.3 56.4 4537.2 604.2 138.2
  1. The number of relevant documents per query in each tier is listed. For Drug Dataset Tier 0 represents original sets of documents found by Boolean queries. Tier 0 statistics for Misc Dataset are based on Boolean queries executed by us on OVID, and does not represent the original set that the reviewers have seen.