Table 1. Interview guide for Veteran participants.

1	About when did you receive your Fitbit from the VA?
2	What made you agree to receive a Fitbit from the VA?
3	Do you have a smart phone? If so, what type of phone (e.g., iPhone, Samsung Galaxy)?
4	Do you have apps on your smart phone that are health-related? If so, what are they?
5	About when did you complete the setup of your Fitbit and Sync My Health Data (SMHD) app?
6	Tell me about your experience setting up the Fitbit for use. •  Did you have any challenges getting it set up? •  [Or if they indicate that they never completed the setup, ask why] •  Did you work with VA staff to setup, use, or share data with the Fitbit?
7	Tell me about your experience using the Fitbit. •  Do you find the Fitbit to be easy or difficult to maintain over time? What challenges, if any, are associated with maintaining the Fitbit? •  How comfortable have you found it to be? Do you wear it every day? •  Do you wear it during the day or night or both? •  What type of data do you monitor with the Fitbit? •  What functions of the Fitbit do you find most valuable? •  Has anything surprised you? •  Have you discussed the data from your Fitbit with your VA provider? If yes, how satisfied have you been with those discussions with your provider? Please explain. •  If your VA care team has seen or can see your data, do you think that would improve communication between you and your care team?
8	Have you experienced any benefits from wearing your Fitbit? What kind? •  Have you made any lifestyle changes based on the Fitbit? •  What are some outcomes you hope for as a result of using a Fitbit? (e.g., increase self-awareness, improve my general health and well-being, help me reach a specific goal)
9	Do you think there is any value in sharing your information from the Fitbit with the VA to help manage your care? Please explain. •  Are you comfortable sharing all information from the Fitbit? Is there certain information you would not want to share?
10	Is there anything else you wished your Fitbit did for you?
11	Has it met your expectations?
12	Would you recommend using a Fitbit to other Veterans? Why or why not?
13	Do you see enough value in the Fitbit that you would buy one yourself, if VA had not provided it?
14	Is there anyone who currently helps you with managing or tracking your activity with the Fitbit on a daily or weekly basis? If yes, how do they help?
15	Is there anything else you would like to volunteer or discuss about the VA's Fitbit that we have not already covered?

Abbreviation: VA, Veterans Affairs.