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Table 5 Intervention information for primary RCT abstracts (R1).

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

  Pharmaceutical intervention (I1) Non-pharmaceutical intervention (I2)
Total abstracts 213 123
Number of treatment arms unknown 1 1
2 treatment arms 161 96
3 treatment arms 33 20
4 or more treatment arms 5 6