Table 3. Disabling agents (n = 121) associated with 126 scuba fatalities; * = Unwitnessed but evidence of an ascent complication.

Disabling agent	Subgroup	n	Mean (SD) age	Male/Female
Medical		48 (38%)	50 (12)	42/6
	Cardiac disease/dysfunction	38
	Oxygen seizure	3
	Immersion pulmonary oedema	≥ 3
	Other	4
Ascent		21 (17%)	39 (13)	18/3
	Rapid ascent	9
	Gas trapping	3
	Inadequate decompression	1
	Unwitnessed*	8
Buoyancy		18 (14%)	42 (11)	9/9
	Negative at surface	8
	Poor control underwater	7
	Grossly overweighted	3
Gas supply		17 (13%)	44 (13)	13/4
	Out of gas	11
	Loss of regulator access	4
	Inappropriate mix	2
Environmental		13 (10%)	38 (11)	12/1
	Conditions	7
	Shark attacks	3
	Entrapment	3
Equipment		4 (3%)	38 (12)	4/0
Unknown		11 (9%)