Table 2. Triggers (n = 139) associated with 126 scuba fatalities; some deaths involved multiple triggers; * = Various faults in regulators, tank valves, oxygen sensors, wet and dry suits .

Trigger	Subgroup	n	Mean (SD) age	Male/Female
Environment		68 (54%)	45 (13)	52/16
	Conditions	37
	Immersion effects	19
	Entrapment	5
	Marine animal	3
	Other	4
Exertion		23 (18%)	52 (9)	21/2
	Pre-dive	4
	During dive	13
	Post-dive	6
Gas supply		15 (12%)	42 (9)	13/2
	Out of gas	8
	Low gas	3
	Incorrect mix	2
	Contamination	1
	Other	1
Equipment*	N/A	10 (8%)	32 (12)	9/1
Anxiety	N/A	10 (8%)	39 (15)	6/4
Primary diver error	N/A	4 (3%)	37 (7)	2/2
Buoyancy	N/A	3 (2%)	51 (10)	1/2
Other	N/A	6 (5%)	43 (15)	5/1
Unknown	N/A	14 (11%)