I missed the explicit part about ethnicity. Rereading that makes me think that those factors are used as a baseline along with age, height, and weight to determ

I missed the explicit part about ethnicity. Rereading that makes me think that those factors are used as a baseline along with age, height, and weight to determine the normal 'indicative' factors like pupil dilation and heart rate, and then flag people who are abnormal given their ethnic, age, height, and weight group norms. It seems that either the phrase in question was poorly worded, or the DHS is in for a serious media storm.