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It is interesting to speculate how much most dive tables are influenced by PFO.

Suppose that, as seems to be the case, PFO is as common as 1 in 4 people, and
in fact is associated with a substantially greater risk of DCS.  Next consider
that most dive tables were constructed based on DCS statistics associated with
test dives, and that test divers presumably were not screened for PFO.  This
implies that tables may be skewed by the fraction of test divers with PFO, and
that no-D times for normal (non-PFO) divers might be substantially longer if PFO
divers were excluded from testing.

If this reasoning is sound, it could explain why tables based on maximum
likelihood analysis show such spread for no-D times between risk categories
(e.g., the Navy tables for 5% DCS risk allow MUCH longer no-D times than 1%
risk).

jheimann@sc*.gt*.co*

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