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Table 1 Number of abstracts in each subcategory in a randomly selected corpus of 455 RCT abstracts.

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

Classes Total R1 R2 R3 N1 N2 N3
   Single RCT Complex RCT RCT substudy RCT protocol or announcement Systematic review Other study
N (%) 455 336 (73.8%) 21 (4.6%) 34 (7.5%) 5 (1.1%) 6 (1.3%) 53 (11.6%)