There are five important epidemiological observations that have been made regarding DI 2-4,14,21-24,108-123:

• The incidence is very low in general - in the order of 0.01-0.05 % (1 to 5 per 10,000 dives).

• There is no demonstrable gender-specific predisposition to DI.

• Novice and experienced divers are at greatest risk for developing DI.

• Dives in excess of 24 meters (80 feet) have a significantly greater incidence of DI.

• Neurological involvement is by far the most common manifestation in recreational divers.

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