Influencing factors of pregnancy loss and survival probability of clinical pregnancies conceived through assisted reproductive technology.

Besides, there were statistically highly significant distribution differences of six COH protocols, fertilization methods, cycle type, no. of embryos transferred and cleavage-stage embryo or blastocyst among pregnancies between Nanjing and Changzhou (all P < 0.001), whereas no difference of infertility type , maternal BMI and paternal BMI were found.

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However, a meta-analysis showed that this difference did not reach statistical significance [ 26 ], and even in a multicenter randomized trial, the opposite result showed in infertile women with PCOS [ 27 ].

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