Why is krugers criteria used ? if we were to sample 100 men , how many would pass the krugres criteria

Not that useful.: If you sample 100 healthy and fertile men, all should have normal kruger scores, theoretically. If you sample 100 healthy infertile men, not sure how many would have normal kruger. Kruger scores for sperm quality are only applicable if all other semen analysis numbers (volume, count and motility) are normal. Invalid if any of these are abnormal. It has very limited applicability nowadays.