Archives of Physical Medicine and Rehabilitation
Volume 89, Issue 4 , Pages 630-640 , April 2008

Conceptualizing and Measuring Confidence in Older Drivers: Development of the Day and Night Driving Comfort Scales

Presented to the Gerontological Society of America, November 2006, Dallas, TX.

  • Image Result

    Probability curve for the 5-category collapsed DCS-D. Graphic representation of the probability of response for each of the 5 categories (0%, 25%, 50%, 75%, 100%). The y axis represents the probabilit

    Probability curve for the 5-category collapsed DCS-D. Graphic representation of the probability of response for each of the 5 categories (0%, 25%, 50%, 75%, 100%). The y axis represents the probability of responding to 1 of these categories (0.0−1.0), and the x axis represents the person measure minus the item measure in logits.

  • Image Result
    Probability curve for the 5-category collapsed DCS-N. Graphic representation of the probability of response for each of the 5 categories (0%, 25%, 50%, 75%, 100%). The y axis represents the probabilit

    Probability curve for the 5-category collapsed DCS-N. Graphic representation of the probability of response for each of the 5 categories (0%, 25%, 50%, 75%, 100%). The y axis represents the probability of responding to 1 of these categories (0.0−1.0), and the x axis represents the person measure minus the item measure in logits.

  • Image Result
    Person and item map for the DCS-D. Person ability is shown on the left and item difficulty on the right (measured in logits or equal intervals). Abbreviations: M, mean; S, 1 SD; T, 2 SDs. Legend is 1

    Person and item map for the DCS-D. Person ability is shown on the left and item difficulty on the right (measured in logits or equal intervals). Abbreviations: M, mean; S, 1 SD; T, 2 SDs. Legend is 1 respondent (located as having a 50% probability of endorsing the item).

  • Image Result
    Person and item map for the DCS-N. Person ability is shown on the left and item difficulty on the right (measured in logits or equal intervals). Abbreviations: M, mean; S, 1 SD; T, 2 SD. Legend is 1 r

    Person and item map for the DCS-N. Person ability is shown on the left and item difficulty on the right (measured in logits or equal intervals). Abbreviations: M, mean; S, 1 SD; T, 2 SD. Legend is 1 respondent (located as having a 50% probability of endorsing the item).

 Supported by the Canadian Driving Research Initiative for Vehicular Safety in the Elderly (CanDRIVE), Canadian Institutes of Health Research.

 No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the authors or upon any organization with which the authors are associated.

 Reprints are not available from the authors.

PII: S0003-9993(07)01844-8

doi: 10.1016/j.apmr.2007.09.037

Archives of Physical Medicine and Rehabilitation
Volume 89, Issue 4 , Pages 630-640 , April 2008

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