While in grad school I had a class of about 80 people where they gave us a stress test. I had about 100 questions and based on your answers a numerical value was given for each question. At the end of the test you added up the numbers and that would give you a range for your stress.
I thought I was pretty normal with a value of 247 until I found out that most people had levels under 50 and the next closest person to me was 120. When the psychiatrist that was administering/revueing the technique heard what my level was he ended the session with the class and started one with me.
Sometimes you just don't know how much stress you're having.