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

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

	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

ISSN: 1472-6947