Outcome
| Type |
Measure |
Description |
Time frame |
Safety issue |
| Primary |
Accumulated heart rate-based load measure (average of all trips during past 2 weeks) |
Mental load (derived from the energy balance estimation, as an indication of stress), measured by accumulated heart rate-based load measure via wearable (average of all trips during past 2 weeks) |
At the beginning of the intervention, intermediate after 2 months (mid of intervention), at the end of the intervention after 4,5 months, and 3 months after the intervention (to measure the impact on a longer-term). |
|
| Secondary |
Work Ability Index |
A summary measure of 7 items (e.g., the demands of work, the worker's health status and resources) identifying the health risks and risks of early retirement. The final WAI score is calculated as the total unweighted score covering the WAI's seven dimensions, or indicators. The combination of dimension values results in a total WAI score that can range from 7 (unable to work) to 49 (full work ability). |
At the beginning of the intervention, intermediate after 2 months (mid of intervention), at the end of the intervention after 4,5 months, and 3 months after the intervention (to measure the impact on a longer-term). |
|
| Secondary |
36-item Short Form Healthy Survey |
Measuring health-related quality of life, consisting of both a physical and mental component. The SF-36 consists of eight scaled scores, which are the weighted sums of the questions in their section. Each scale is directly transformed into a 0-100 scale. The higher the score the less disability i.e., a score of zero is equivalent to maximum disability and a score of 100 is equivalent to no disability. |
At the beginning of the intervention, intermediate after 2 months (mid of intervention), at the end of the intervention after 4,5 months, and 3 months after the intervention (to measure the impact on a longer-term). |
|
| Secondary |
Perceived Stress Scale 10 |
Measuring perceived stress. The questions ask about feelings and thoughts during the last month. In each case, respondents are asked how often they felt a certain way on a five-point scale from 'never' to 'very often'. Answers are then scored as follow: Never = 0; Almost never = 1; Sometimes = 2; Fairly often = 3; Very often = 4. To calculate a total PSS score, responses to the four positively stated items (items 4, 5, 7 and 8) first need to be reversed (i.e. 0 => 4; 1 => 3; 2 => 2; 3 => 1; 4 => 0). The PSS score is then obtained by summing across all items. Higher scores indicate higher levels of perceived stress. |
At the beginning of the intervention, intermediate after 2 months (mid of intervention), at the end of the intervention after 4,5 months, and 3 months after the intervention (to measure the impact on a longer-term). |
|
| Secondary |
Driving Behaviour Inventory - General Driver Stress |
A 16-item instrument extracted from the Driver Behaviour Inventory that measures general driver stress. The DBI-Gen consists of 16 items that tap a general disposition, or "trait" susceptibility, to driver stress. Responses are made on a Likert scale ranging from 0 to 100, indicating the level of agreement with each statement. Scoring consisted of the mean response to the 16 tems, with higher scores indicating greater trait driver stress susceptibility. |
At the beginning of the intervention, intermediate after 2 months (mid of intervention), at the end of the intervention after 4,5 months, and 3 months after the intervention (to measure the impact on a longer-term). |
|
| Secondary |
General Self-Efficacy Scale |
Measuring a broad and stable sense of personal competence to deal effectively with a variety of stressful situations. The total score is calculated by finding the sum of all 10 items. For the GSE, the total score ranges between 10 and 40, with a higher score indicating more self-efficacy. |
At the beginning of the intervention, intermediate after 2 months (mid of intervention), at the end of the intervention after 4,5 months, and 3 months after the intervention (to measure the impact on a longer-term). |
|
| Secondary |
Depression Anxiety Stress Scales |
A 42-item self-report instrument designed to measure the related negative emotional states of depression, anxiety, tension/stress.The DASS assesses negative emotional symptoms by using a 4-point Likert scale, ranging from 0 to 3. It has 3 subscales (depression, anxiety, and stress) with 14 items in each subscale for the DASS 42. These subscales are scored by the addition of the total item scores, which can range from 0 to 42. Maximum score: 126 for the 42-item DASS. A higher score on the DASS indicates greater severity or frequency of these negative emotional symptoms. |
At the beginning of the intervention, intermediate after 2 months (mid of intervention), at the end of the intervention after 4,5 months, and 3 months after the intervention (to measure the impact on a longer-term). |
|
| Secondary |
Fatigue Assessment Scale |
A short, valid, reliable and easy to administer unidimensional fatigue questionnaire. The FAS is a 10-item general fatigue questionnaire to assess fatigue. Five questions reflect physical fatigue and 5 questions (questions 3 and 6-9) mental fatigue. An answer to every question has to be given, even if the person does not have any complaints at the moment. Scores on question 4 and 10 should be recoded (1=5, 2=4, 3=3, 4=2, 5=1). Subsequently, the total FAS score can be calculated by summing the scores on all questions (recoded scores for questions 4 and 10). The total score ranges from 10 to 50. A total FAS score < 22 indicates no fatigue, a score = 22 indicates fatigue. |
At the beginning of the intervention, intermediate after 2 months (mid of intervention), at the end of the intervention after 4,5 months, and 3 months after the intervention (to measure the impact on a longer-term). |
|
| Secondary |
Epworth Sleepiness Scale |
To measure daytime sleepiness, asking the subject how likely he/she is to doze off or fall asleep in different situations of everyday life. The test is a list of eight situations in which the respondents rates his/her tendency to become sleepy on a scale of 0, no chance of dozing, to 3, high chance of dozing. All answers to the questions need to be added.The total score is based on a scale of 0 to 24, with a higher score means a higher respondent's sleepiness. |
At the beginning of the intervention, intermediate after 2 months (mid of intervention), at the end of the intervention after 4,5 months, and 3 months after the intervention (to measure the impact on a longer-term). |
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