@LuckyGuy – you have only just begun. Your measurement sample was far too small and cannot be used to extrapolate universal snotification levels.
At a minimum, a good research project would call for:
1) gender snot levels – do women produce more than men for the average cold?
2) age snot levels – who produces more? 5–10 year old? 10–20? 20–30? and so on.
3) the effect of over-the-counter drugs on snot levels
4) color and quantity? Are they related?
I think this should be written up as a grant proposal and submitted to the Kleenex Corporation for funding.