Table 1. Overview of recent meta-analyses and outcomes measured.

Meta-analysis	Studies	N	Relative risk (95% confidence interval)
Gelbaya et al.
CP/ET	6	2515	1.09 (0.92–1.29)
CP/cycle	4	1142	1.08 (0.82–1.44)
PR/ET	3	1612	1.13 (0.97–1.31)
LB/cycle	1	374	0.87 (0.57–1.34)
LB/ET	2	1729	1.08 (0.83–1.40)
Miscarriage/CP	3	658	1.17 (0.84–1.63)
EP/CP	3	658	1.22 (0.34–4.38)
Khairy et al.
CP/patient	7	1241	1.11 (0.95–1.31)
LB/patient	2	402	0.94 (0.64–1.39)
Miscarriage/patient	2	649	1.06 (0.53–2.11)
EP/patient	2	649	2.24 (0.7–7.24)
Poustie et al.
CP/patient	7	1240	1.09 (0.93–1.28)
LB/patient	2	401	0.94 (0.63–1.39)
Miscarriage/patient	3	676	1.17 (0.61–2.27)
EP/patient	2	648	2.24 (0.69–7.22)
MP/patient	1	28	1.73 (0.38–7.98)
MB/patient	1	28	0.87 (0.14–5.32)
Ruopp et al.
CP/ET	10	2801	1.15 (1.03–1.27)
Implantation/ET	3	612	1.08 (0.69–1.71)
Miscarriage/ET	4	671	1.19 (0.86–1.65)

CP, clinical pregnancy; EP, ectopic pregnancy; ET, embryo transfer; LB, live birth; MB, multiple birth; MP, multiple pregnancy; PR, pregnancy rate.