I often listen to a programme on BBC Radio 4 which deals with statistics and the like (can't for the life of me remember its name) and last week's edition had an item on this subject. The presenter also quoted a survey on Vietnam war veterans which came to a similar conclusion, contrary to the received wisdom that there was a much higher percentage of suicides among war vets than the equivalent sample for non-combattants. However I'm no statistician, and bearing in mind the old saying about "lies, damned lies and statistics" I'm keeping an open mind on this one.