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Table 2 The number of unstructured and structured abstracts in Group A, the original set of abstracts and Group R1, the primary RCT reports from the randomly selected subset.

From: Are decision trees a feasible knowledge representation to guide extraction of critical information from randomized controlled trial reports?

  Number of Abstracts in A Number of Abstracts in R1
Total abstracts 7620 (100%) 336 (100%)
Unstructured abstracts 3179 (42%) 106 (32%)
Structured abstracts 4441 (58%) 230 (68%)
Structured abstracts with explicit heading for intervention 283 (3.7%) 14 (4.2%)
Structured abstracts with explicit heading for population 433 (5.7%) 17 (5.0%)
Structured abstracts with explicit heading for outcome measures 329 (4.3%) 18 (5.3%)
Structured abstracts with explicit heading for all three subheadings 162 (2.2%) 11 (3.3%)