Table 2.

Main results of the meta-analysis

Group		Subgroup	I2 (%)	OR(95%CI)	P value	begg(Pr > |z|)	Egger(P > |t|)
CP	dfi(>27 %)	ivf	56.1	1.742(1.382–2.195)	0	0.913	0.974
		icsi	0	0.895(0.629–1.273)	0.537
		SCSA	49.0	1.242(0.978–1.577)	0.076
		Tunel	0	1.873(1.358–2.584)	0.000
		overall	52.5	1.437(1.186–1.742)	0
	dfi(15–27 %)	ivf	–	0.922(0.409–2.083)	0.846	0.308	0.427
		icsi	0	1.961(1.230–3.127)	0.005
		SCSA	25.3	1.480(0.921–2.377)	0.105
		AOT	–	2.167(0.992–4.732)	0.052
		overall	11.6	1.639(1.093–2.459)	0.017
	dfi(≤15 %)	ivf	0	0.759(0.571–1.008)	0.057	0.451	0.006
		icsi	0	1.062(0.780–1.446)	0.703
		Tunel	0	1.183(0.619–2.261)	0.611
		comet	0	0.949(0.422–2.135)	0.889
		AOT	21.7	0.701(0.498–0.987)	0.042
		SCSA	0	0.993(0.728–1.354)	0.963
		overall	0	0.886(0.719–1.090)	0.252
BP	dfi(>27 %)	ivf	0	1.178(0.752–1.845)	0.473	0.462	0.28
		icsi	0	0.766(0.491–1.194)	0.239
		SCSA	0	0.952(0.697–1.302)	0.759
		overall	0	0.952(0.697–1.302)	0.759
	dfi(15–27 %)	icsi	–	1.318(0.552–3.145)	0.534	–	–
PL	dfi(>27 %)	ivf	0	1.262(0.589–2.704)	0.549	1	0.866
		icsi	0	0.542(0.290–1.013)	0.055
		SCSA	0	0.786(0.491–1.258)	0.316
		overall	0	0.786(0.491–1.258)	0.316
	dfi(15–27 %)	ivf	–	4.358(0.566–33.547)	0.157	1	0.775
		icsi	0	0.985(0.370–2.619)	0.976
		SCSA	0	1.509(0.655–3.476)	0.334
		overall	0	1.509(0.655–3.476)	0.334
	dfi(≤15 %)	ivf	0	0.506(0.191–1.341)	0.171	0.707	0.665
		icsi	0	0.577(0.203–1.641)	0.303
		Tunel	0	0.349(0.103–1.175)	0.089
		SCSA	0	0.739(0.248–2.195)	0.586
		comet	–	0.503(0.128–1.975)	0.325
		overall	0	0.538(0.264–1.097)	0.088
Pregnant group vs not pregnant group	–			SMD(95%CI)
		ivf	79.4	0.502(−0.356–1.359)	0.251	0.764	0.17
		icsi	87.2	0.259(−0.421–0.939)	0.455
		SCSA	83.5	0.345(−0.110–0.799)	0.137
		overall	83.5	0.345(−0.110–0.799)	0.137