Inter-observer agreement between the two non-expert examiners was good for the ESHRE/ESGE (k = 0.74, 95% CI 0.55-0.92) and very good for ASRM and CUME classification systems (k = 0.96, 95% CI 0.88-1.00; and k = 0.91, 95% CI 0.79-1.00), respectively. Agreement between the ESHRE/ESGE and ASRM was moderate for both examiners. Agreement between ESHRE/ESGE and CUME classifications was moderate for examiner 1 and good for examiner 2. Agreement between ASRM and CUME was good for both examiners. Conclusions: The three classifications have good (ESHRE/ESGE) or very good (ASRM, CUME) inter-observer agreement. Agreement between ASRM and CUME was higher than that for ESHRE-ESGE and ASRM and ESHRE-ESGE and CUME. OC15.04 4D ultrasound guidance improves embryo transfer success rates: a randomised controlled trial
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