S. Marulanda - Academia.edu (original) (raw)
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Papers by S. Marulanda
Transportation Research Record: Journal of the Transportation Research Board, 2014
Transportation Research Record Journal of the Transportation Research Board
Driver distraction significantly impairs performance and increases the likelihood of vehicle cras... more Driver distraction significantly impairs performance and increases the likelihood of vehicle crashes. Understanding the underlying reasons of distraction engagement as well as individuals’ susceptibility to different types of distractions is a necessary step to develop effective solutions to mitigate distraction. This paper describes the development and initial evaluation of a questionnaire, the Susceptibility to Driver Distraction Questionnaire (SDDQ), which investigates distraction involvement by making a distinction between voluntary and involuntary engagement in secondary activities, or distractions as referred to in this paper. We present the theoretical underpinnings, the questionnaire itself, as well as the results of an online survey examining the reliability and validity of the newly developed questionnaire. Our analyses show moderate to high levels of internal consistency among the questionnaire items, providing support to the reliability of SDDQ. Our results also suggest ...
The Susceptibility to Driver Distraction Questionnaire (SDDQ) investigates voluntary and involunt... more The Susceptibility to Driver Distraction Questionnaire (SDDQ) investigates voluntary and involuntary factors associated with driver distraction. It consists of 39 items in six subscales: (1) self-reported distraction engagement, (2) attitudes towards distractions, (3) perceived control of driving while engaged in distractions, (4, 5) injunctive and descriptive social norms associated with distraction engagement, and (6) susceptibility to involuntary distractions. The test-retest reliability of SDDQ was assessed using a sample of 43 adults, ages 25-39. The mean time between test and retest conditions was approximately 20 days. For subscale averages, test-retest reliability was assessed using intra-class correlation (ICC) statistics; for individual items, it was assessed through weighted kappa statistics. ICC results suggest good to excellent test-retest reliability for subscales of self-reported distraction engagement, attitudes towards distractions, and descriptive social norms. Perceived control of driving while engaged in distractions had fair test-retest reliability, and injunctive norms and susceptibility to involuntary distraction subscales had poor test-retest reliabilities. These last two subscales may have to be redesigned; we provide relevant suggestions in the discussion section. As an additional preliminary analysis, data from a sample of 10 additional participants were used to investigate consistency of responses across longer periods of time. The mean time between test-retest conditions in this sample was approximately 8 months. The findings were, in general, similar to the main sample. Overall, SDDQ appears to have good test-retest reliability. A larger sample is recommended to further validate these results, in particular across long test-retest periods.
Transportation Research Record: Journal of the Transportation Research Board, 2014
Transportation Research Record Journal of the Transportation Research Board
Driver distraction significantly impairs performance and increases the likelihood of vehicle cras... more Driver distraction significantly impairs performance and increases the likelihood of vehicle crashes. Understanding the underlying reasons of distraction engagement as well as individuals’ susceptibility to different types of distractions is a necessary step to develop effective solutions to mitigate distraction. This paper describes the development and initial evaluation of a questionnaire, the Susceptibility to Driver Distraction Questionnaire (SDDQ), which investigates distraction involvement by making a distinction between voluntary and involuntary engagement in secondary activities, or distractions as referred to in this paper. We present the theoretical underpinnings, the questionnaire itself, as well as the results of an online survey examining the reliability and validity of the newly developed questionnaire. Our analyses show moderate to high levels of internal consistency among the questionnaire items, providing support to the reliability of SDDQ. Our results also suggest ...
The Susceptibility to Driver Distraction Questionnaire (SDDQ) investigates voluntary and involunt... more The Susceptibility to Driver Distraction Questionnaire (SDDQ) investigates voluntary and involuntary factors associated with driver distraction. It consists of 39 items in six subscales: (1) self-reported distraction engagement, (2) attitudes towards distractions, (3) perceived control of driving while engaged in distractions, (4, 5) injunctive and descriptive social norms associated with distraction engagement, and (6) susceptibility to involuntary distractions. The test-retest reliability of SDDQ was assessed using a sample of 43 adults, ages 25-39. The mean time between test and retest conditions was approximately 20 days. For subscale averages, test-retest reliability was assessed using intra-class correlation (ICC) statistics; for individual items, it was assessed through weighted kappa statistics. ICC results suggest good to excellent test-retest reliability for subscales of self-reported distraction engagement, attitudes towards distractions, and descriptive social norms. Perceived control of driving while engaged in distractions had fair test-retest reliability, and injunctive norms and susceptibility to involuntary distraction subscales had poor test-retest reliabilities. These last two subscales may have to be redesigned; we provide relevant suggestions in the discussion section. As an additional preliminary analysis, data from a sample of 10 additional participants were used to investigate consistency of responses across longer periods of time. The mean time between test-retest conditions in this sample was approximately 8 months. The findings were, in general, similar to the main sample. Overall, SDDQ appears to have good test-retest reliability. A larger sample is recommended to further validate these results, in particular across long test-retest periods.