Quote:
there is no such thing as a "normal" person
Of course there is a ‘normal’ if you like it’s the ‘average’ – normal is a measurement of central tendency (it is a range not a point) – simplistically it is the area where most of the measurement are, from there variations trend in both directions. Height is the easiest to imagine, if you measure 1000 people, typically most will be towards the centre, that is ‘normal’, less and less will occur towards the extremities (there are fewer really tall or really short people).
Hence NT is a term describing the people that are close to the middle of the measurement (of what is another question), AS people will be to one side of this normal range (and will also cover a range). Therefore, in my opinion there is nothing wrong with the term NT as a descriptive label, but, some people misuse it just like other labels (e.g., race and religon).