PLOD1 and Klinefelter syndrome: On the other hand, the levels of FSH and LH were significantly higher than those in the fertile control group (p=0.000, Moreover, the study results revealed that, volumes of both right and left testis of severe oligozoospermic group (from non-mosaic Klinefelter’s syndrome carriers) were significantly higher than those of cryptozoospermic group (from non-mosaic Klinefelter’s syndrome carriers) (p=0.016 for right testis and p= 0.020 for left testis ); while no significant difference in the levels of hormones was noted between the two groups (Table V).