Fig. 2

The violin plot of sperm DFI and the studied routine semen parameters stratified by the 4 clusters based on the variables among all participants. Green dots refer to cluster 1 (low-level DFI/high-level semen parameter group); red dots refer to cluster 2 (low-level DFI/median-level semen parameter group); blue dots refer to cluster 3 (low-level DFI/low-level semen parameter); purple dots refer to cluster 4 (high-level DFI/low-level semen parameter)