Fig. 4.

Correlations between relative sperm telomere length (STL) and progressive motility. a Absence of a significant correlation in the total population (n = 73). b Absence of a significant correlation in normozoospermic patients (n = 33). c Absence of a significant correlation in non-normozoospermic patients (n = 40). d A significant correlation in asthenozoospermic patients (n = 9). e A significant correlation in teratozoospermic patients (n = 32). r_p, Pearson’s correlation coefficient; r_s, Spearman’s rank correlation coefficient; P, P value