Outcome
Type |
Measure |
Description |
Time frame |
Safety issue |
Primary |
Change in frequency of smartphone use while driving |
Frequency of smartphone use is recorded by the LifeSaver app among the three app modes. Within-driver smartphone use over the 8-week study period is compared as the app modes change. |
Week 2, 4, 6, and post-intervention at Week 8 |
|
Secondary |
Change in frequency of self-reported smartphone use while driving |
The change in self-reported smartphone use while driving will be assessed using the same within-driver and between-driver comparisons as the primary outcome measure. Self-reported smartphone use is collected through 10 items on a participant survey that is completed at enrollment, Weeks 2, 4, 6 and post-intervention at Week 8. Participants report how many days during the previous 2 weeks (0-14) that they drove, and talked on a hands-held smartphone, talked on a hands-free smartphone, sent a text, and read a text while driving. Participants also report how many times per day (free text, any number greater than or equal to 0) that they drove, and talked on a hands-held smartphone, talked on a hands-free smartphone, sent a text, and read a text while driving. There is no overall self-reported smartphone use score for these survey items. |
Weeks 2, 4, 6, and Post-Intervention at Week 8 |
|
Secondary |
Participant acceptability of the smartphone App: survey |
Participant assessment of accessibility will be collected, and Manual Mode and Auto-Detect Mode of the LifeSaver app will be compared. Participants complete a survey at Week 8, post-intervention. 8 items in the survey ask participants about accessibility of the app through Likert scales (range from Not at all to Extremely). 3 items in the survey ask participants about accessibility of the app through open-ended questions, where participants are able to enter free text. There is no overall score for these survey items. |
Post-Intervention at Week 8 |
|
Secondary |
Participant usability of the smartphone app: survey |
Participant assessment of usability will be collected, and Manual Mode and Auto-Detect Mode of the LifeSaver app will be compared. Participants complete a survey at Week 8, post-intervention. 8 items in the survey ask participants about usability of the app through Likert scales (range from Not at all to Extremely). 3 items in the survey ask participants about usability of the app through open-ended questions, where participants are able to enter free text. There is no overall score for these survey items. |
Post-Intervention at Week 8 |
|