After allowing for other causes, they discovered that males who were below age 20 when poisoned have an abnormally high proportion of girl children. The normal ratio is 51 % boys to 49 % girls, but among these men's children only 45.8 % are boys. This is consistent with PCBs 'ability to "feminize" organisms.
在排除其他原因後，發現男性在二十歲以前中毒者，第二代生育男孩的比例較低，與正常的男女比例百分之四十九比五十一，男性只佔百分之四十五強，大致符合多氯聯苯「雌化自然」的特質。