CATCH-UP vaccines: protocol for a randomized controlled trial using the multiphase optimization strategy (MOST) framework to evaluate education interventions to increase COVID-19 vaccine uptake in Oklahoma

Table 1 Experimental conditions in the 2³ factorial design for the COVID-19 vaccine intervention

	Factor
Condition	Process Improvement	Barrier Elicitation and Reduction	Teachable Moment Messaging
1	No	No	No
2	No	Yes	No
3	No	No	Yes
4	No	Yes	Yes
5	Yes	Yes	Yes
6	Yes	No	Yes
7	Yes	No	No
8	Yes	Yes	No

ISSN: 1471-2458