Fig. 1

Comparisons of sperm DNA methylation levels between groups on paternal imprinting sequences. Data are represented as median +/− interquartile. Each sample is represented on the graph, as black diamond for normozoospermic (N), dark blue circle for seminoma (S), electric blue circle for seminoma normozoospermic (SN), light blue circle for seminoma oligozoospermic (SO), and gray square for oligozoospermic (O) men. Gray stars refer to data from oligozoospermic men with history of cryptorchidism. *p < 0.05 and **p < 0.01 represent significant differences after adjusting for age