Table 3 Crude rates of unsafe conditions in the written, memorized, and no checklist groups
| Â | 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 |
| Â | Â | Proportion of divers (%) | ||
Participants who did not dive | 22 | 6.1% | 2.3% | 14.1% |