Figure 2From: Use of a fixed combination of acetylsalicylic acid, acetaminophen and caffeine compared with acetaminophen alone in episodic tension-type headache: meta-analysis of four randomized, double-blind, placebo-controlled, crossover studiesSummary flowchart of the patients included in the meta-analysis. Safety analysis data taken from Migliardi et al. [10]; EE = efficacy evaluable; ITT = intention-to-treat.Back to article page