Fig. 3From: Can we achieve better trial recruitment by presenting patient information through multimedia? Meta-analysis of ‘studies within a trial’ (SWATs)Secondary outcome—retained at primary endpoint of the host trial. Heterogeneity chi-squared = 3.62, p = 0.164; I.2 = 44.7%, test of pooled odds ratio = 1: z = 0.34, p = 0.737Back to article page