In 2002, Carleton University ran a survey to look at stress among tech workers – “Coping with Job Uncertainty : A Survey of Employed and Unemployed High Technology Workers”. The report identified numerous interesting results, however the one that I found particularly noteworthy was the fact they found that people who have an optimistic predisposition have a natural buffer against stress. In fact, the more optimistic one’s nature, the less stress they reported.
The full report is available here.