Table 3.

Crude rates of unsafe conditions in the written, memorized, and no checklist groups

	No. of unsafe conditions	Crude rate per 100 dives
Outcome		Written checklist (59 dives)	Memorized checklist (623 dives)	No checklist (158 dives)
Underweight	26	3.4	2.7	4.4
Overweight	24	1.7	3.0	2.5
Not familiar with Dive computer	10	0.0	1.4	0.6
Tank not well secured	9	0.0	0.6	3.2
Unfamiliar with the use of BCDa	8	0.0	1.1	0.6
Tables Not used before	6	0.0	0.8	0.6
Tight/ uncomfortable dive suit	5	0.0	0.6	0.6
Dive computer battery problems	3	0.0	0.3	0.6
Incorrect BCD size	3	0.0	0.5	0.0
Size changed between dives	3	0.0	0.2	1.3
Fins - Caused cramp	2	0.0	0.3	0.0
Inaccurate dive gauge	2	1.7	0.0	0.6
BCD Inadequate buoyancy	2	0.0	0.3	0.0
Dive computer not turned on before dive	1	0.0	0.2	0.0
Dive tables – misread	1	0.0	0.2	0.0
Computer hard to understand	1	0.0	0.2	0.0
Unable to understand dive tables	1	0.0	0.2	0.0
Max depth indicator problem	1	0.0	0.2	0.0
Unable to locate alternate regulator	0	0.0	0.0	0.0
Unit confusion on the dive gauge	0	0.0	0.0	0.0
Total Unsafe conditions	108	6.8	12.8	15.2
		Proportion of divers (%)
Participants who did not dive	22	6.1%	2.3%	14.1%

^aincludes confusion on BCD inflate/ deflate, & didn’t know how to inflate/ deflate the BCD