A survey of the work and sleep patterns of Great Barrier Reef Pilots
LIST OF TABLES
| Table 4.0 |
Distribution of scores across
the items comprising the demographics of the sample |
| Table 4.1 |
Distribution of scores across
the items comprising the industry specific scale |
| Table 4.2 |
Work history in the previous
six months |
| Table 5.0 |
Distribution of scores for
ratings of general health and fitness |
| Table 5.1 |
Distribution of scores on
the BMI rating scale |
| Table 5.2 |
Analysis of health and lifestyle
habits: smoking, consuming caffeine and alcohol, at sea, ashore and at
home |
| Table 5.3 |
Distribution of scores on
the sea sickness scale |
| Table 5.4 |
Distribution of scores across
the items comprising the chronic fatigue scale |
| Table 5.5 |
Distribution of scores across the items examining feelings
of tiredness at home |
| Table 6.0 |
Analysis of the mean total
duration of sleep, number of sleeps, and duration of each sleep per 24
hours, at sea, ashore and at home |
| Table 6.1 |
Analysis of the mean number
and duration of naps per 24 hours, at sea, ashore and at home |
| Table 6.2 |
Analysis of the mean scores
(mins) for sleep latency and time to feel alert, at sea, ashore and at
home |
| Table 6.3 |
Analysis of the mean scores
for ratings of sleep difficulties and disturbances, at sea, ashore and
at home |
| Table 6.4 |
Analysis of the mean duration
of sleep and naps required by pilots per 24 hours, at sea, ashore and
at home |
| Table 6.5 |
Analysis of the rating of
sleep obtained at sea, ashore and at home |
| Table 6.6 |
Distribution of scores on the strategies
used to promote sleep, at sea, ashore and at home |
| Table 7.0 |
A comparison of scores on
languidity and flexibility between pilots and normative data |
| Table 7.1 |
Distribution of scores across
the five items comprising the morningness/eveningness scale |
| Table 8.0 |
Distribution of scores across
the items comprising tension and fatigue on the bridge |
| Table 8.1 |
Distribution of scores for the onset of
fatigue at the beginning and end of a work assignment |
| Table 8.2 |
Distribution of scores across
the thirteen items comprising the contributing factors to fatigue scale |
| Table 8.3 |
Distribution of scores across
the six items comprising strategies used to combat fatigue |
| Table 8.4 |
Distribution of scores for
the two items relating to the extent of performance decrement on the
bridge |
| Table 8.5 |
Distribution of scores across
the three items comprising the performing tasks and making decisions
scale. |
| Table 8.6 |
Distribution of scores across
the two items comprising the concentration scale |
| Table 8.7 |
Distribution of scores across
the six items comprising the physical effects scale |
| Table 8.8 |
Distribution of scores across
the six time periods comprising the performance vulnerability scale |
| Table 8.9 |
Distribution of scores across
the two items comprising the boredom scale |
| Table 8.10 |
Distribution of scores
across the three items comprising the critical need to be alert scale |
| Table 8.11 |
Distribution of scores
across the three items comprising the ship safety scale |
| Table 8.12 |
Distribution of scores
across the three items comprising the common fatigue scale |
| Table 9.0 |
Frequency of the best features
of working as a Great Barrier Reef pilots |
| Table 9.1 |
Distribution of the worst
features of working as a Great Barrier Reef pilot |
| Table 10.0 |
Distribution of scores
across the seven items comprising the marital satisfaction scale |
LIST OF FIGURES
| Figure 5.0 |
Mean number of cigarettes,
cups of coffee and alcoholic drinks, at sea, ashore and at home |
| Figure 6.0 |
Mean total duration of
sleep, number of sleep periods and duration of each period per 24 hours
at sea, ashore and at home |
| Figure 6.1 |
Mean duration and number
of naps per 24 hours at sea, ashore and at home |
| Figure 6.2 |
Mean scores for sleep latency
and time to feel alert at sea, ashore and at home |
| Figure 6.3 |
Mean scores for ratings
of sleep difficulties, and disturbances at sea, ashore and at home |
| Figure 6.4 |
Mean total duration of
sleep and naps required per 24 hours at sea, ashore and at home |
CRONBACH’S ALPHA VALUES
Cronbach’s alpha coefficients were calculated to assess the reliability
of each of the aggregate scores. The procedure is widely used for this purpose
since it uses a range of statistical characteristics from the raw data. An
alpha coefficient of over 0.65 is generally acceptable.
Table 2a shows the values for Cronbach’s alpha coefficients for scale
items
| Item |
Cronbach’s coefficient alpha |
| Dyadic Adjustment Scale |
0.86 |
Circadian Type Inventory
Languidity
Flexibility |
0.61
0.63 |
| Chronic Fatigue |
0.75 |
Sleep difficulties
At sea
Ashore
Home |
0.72
0.69
0.75 |
Sleep disturbances
At sea
Ashore
Home |
0.72
0.85
0.48 |
| Performance decrement on the bridge |
0.92 |
| Performing tasks and making decisions |
0.88 |
| Concentration |
0.75 |
| Physical effects |
0.85 |
| Boredom |
0.69 |
| Critical need to be alert |
0.57 |
| Risk to ship safety |
0.42 |
| Common fatigue |
|
| Marital adjustment |
0.86 |
