Fig. 4From: External quality assessment scheme for sperm DNA fragmentation: a pilot study in ChinaComparison of the mean bias of 10 laboratories in 2021 and 2022. The 10 points on the left are the mean bias of two samples of 10 participants in 2021. The 10 points on the right are the mean bias of the two samples in 2022 for those 10 participantsBack to article page