Fig. 2From: Can we achieve better trial recruitment by presenting patient information through multimedia? Meta-analysis of ‘studies within a trial’ (SWATs)Secondary outcome—responded positively to invitation. Heterogeneity chi-squared = 1.59, p = 0.662; I.2 = 0.0%, test of pooled odds ratio = 1: z = 0.28, p = 0.778Back to article page