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Jason wrote
#I know that the Americans claim fantasticly good safety records with mix 
#but I also know that Americans as a rule (don't you just love sweeping 
#generalisations) tend not to report/admit to DCI.  The culture there 
#seems to regard DCI as a "mistake" on the part of the diver.  Virtually 
#everyone I know who dives mix has been bent.  (not Richard Taylor)  I 
#have been hit on mix, and in response to the question about variations 
#from day to day, I was hit on a profile that I had dived the week before 
#without problems, and I dived it again a few weeks later without 
#problems.

If you accept there is a random element to developing DCS, then on any one 
dive it will be impossible to determine if the susceptibility (chance) in 
any one individual varies from day to day. Simplistically it is a binary 
outcome, you get hit or you don't. EXCEPT where divers have gone way 
outside acceptable dive profiles, a hit in one seldom is matched by a hit 
in his/her buddy.

If you roll a die, sometimes it comes up six: it doesn't have to mean that 
you were more suceptible to getting a six on that particular roll.

Bob Talbot

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