NCT04805931 (VEText).

Study name	VEText message framing and COVID‐19 vaccine uptake among at‐risk veterans (VEText)
Starting date	15 March 2021
Contact information	Alaina Mori, BA(206) 247‐6782, alaina.mori@va.gov
Methods	Study design: randomised controlled trial Type of publication: trial registration Setting: Veterans Health Administration Country: USA Language: English
Intervention	Control: will receive a text message with standard messaging used to alert veterans that they are eligible for the COVID‐19 vaccine and offer scheduling embedded within the text message. Intervention A: will receive a text message with a behavioural scarcity message used to alert veterans that they are eligible for the COVID‐19 vaccine and offer scheduling embedded within the text message. Intervention B: will receive a text message with a behavioural social good message used to alert veterans that they are eligible for COVID‐19 vaccine and offer scheduling embedded within the text message.
Population	Population: veterans. Inclusion criteria: must be enrolled into VHA care; Veterans must meet age or illness institutional priority guidelines for eligibility for COVID‐19 vaccine receipt.
Outcomes	Primary outcome Vaccine appointments scheduled/completed [ Time frame: 7 days post‐randomisation]
Estimated completion date and number of participants	1 November 2021 with 4311 participants
Notes	Funding: VA Puget Sound Health Care System COI: none