Table 1. Single medium versus sequential medium. Ongoing pregnancy rate outcomes. Random effects.
Trial	Single-ECM n/N	Sequential-ECM n/N	RR	95%CI
Cleavage stage
Campo et al., 2010	18/85	19/87	0.97	0.55-1.70
Blastocyst stage
Sepulveda et al., 2009	28/40	20/40	1.40	0.98-2.07
Macklon et al., 2002	20/98	10/48	0.98	0.51-1.94
Cleavage and Blastocyst stages
Sfontouris et al., 2015	22/50	24/50	0.92	0.60-1.40
Total (Random effects) combined	88/273	73/225	1.11	0.87-1.40
Blastocyst stage only (Random effects) combined	48/138	30/88	1.29	0.93-1.78
Total Chi2=0.71      p=0.39 Cochran Q=2.72    p=0.44 I2=0% (95% CI=0% to 67.9%)		Blastocyst stage only Chi2=2.35      p=0.13 Cochran Q=0.90    p=0.34