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Table 3 Crude rates of unsafe conditions in the written, memorized, and no checklist groups

From: Mishaps and unsafe conditions in recreational scuba diving and pre-dive checklist use: a prospective cohort study

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