TR- I saw a study on TV about altitude sickness-part of a show about climbing on PBS-that used college students as subjects.

Something to be aware of-after living for about a year at altitude, I went off to college and when I came back home, I woke up the next day with pulmonary edema or pneumonia (same basic symptoms) that almost killed me. No idea what caused it-probably a cold that just got worse quickly because of the altitude. So, the lesson here is make sure you are fit and healthy before going anywhere at altitude. A minor annoyance at sea level or so, can be very serious up high.