Table 1.
Background data and neuropsychological test results for the 50 diving school students included in the baseline study
| Mean | SD | Min–max | |
|---|---|---|---|
| Age | 25.3 | 4.3 | 18–35 |
| Years of education | 12.1 | 1.5 | 9–16.5 |
| Self-reported alcohol consumption (L/year) | 4.96 | 3.6 | 0–14.7 |
| Prevalence of smokers (%) | 51.4 | 0.5 | |
| Prevalence of smokers or use of smokeless tobacco (snus) (%) | 59.5 | 0.5 | |
| Cigarettes/week | 66 | 65 | 0–210 |
| Prevalence right-handers | 86 | ||
| Prevalence of reading difficulties | 20 | ||
| Self-reported neuropsychiatric symptoms (Q16)b | 1.2 | 1.5 | 0–7 |
| Tests for intellectual ability | |||
| WAIS Information number correct (raw score)a | 20.7 | 3.9 | 11–28 |
| WAIS Block Design (raw score)a | 42.2 | 5.8 | 28–48 |
| Tests for visuomotor processing speed | |||
| WAIS Digit Symbol (number correct)a | 58.2 | 9.7 | 40–78 |
| Trail Making Test A (s)b | 23.5 | 7.1 | 12–45 |
| Trail Making Test B (s)b | 68.6 | 35.3 | 29–236 |
| Attention span/working/visual memory | |||
| WAIS Digit Span forwardsa | 6.6 | 1.2 | 4–9 |
| WAIS Digit Span backwardsa | 5.6 | 1.5 | 3–8 |
| Benton Visual Retention Test correcta | 8.4 | 1.0 | 6–10 |
| Benton Visual Retention Test errorsb | 2.0 | 1.4 | 0–6 |
| Motor speed/manual dexterity | |||
| Pegboard dominant hand (s)b | 59.4 | 6.5 | 47–75 |
| Pegboard non-dominant hand (s)b | 65.3 | 10.9 | 49–114 |
| Spatial skills/spatial memory | |||
| Tactual Performance Test (TPT) total time (min)b | 10.7 | 4.0 | 3.2–26.1 |
| Tactual Performance Test (TPT) Memory (number correct)a | 8.8 | 0.9 | 7–10 |
| Tactual Performance Test (TPT) Localization (number correct)a | 7.7 | 1.5 | 4–10 |
| Tests for Reaction Time (NES2) | |||
| Simple Reaction Time (SRT) (ms)b | 222 | 19 | 184–276 |
| Continuous Performance Test (CPT) (ms)b | 373 | 30 | 323–444 |
aA higher value is a better score
bA lower value is a better score