Incentives and Trust Are the Main Drivers of Recruiting Participants in 6 African Countries via Web-Based Environments: A Vignette Survey Experiment.

In this context, it should be noted that the willingness to participate in surveys and data collection efforts is on the decline in many countries around the world [ 8 , 9 ]; a worrying trend that makes it even more critical to better understand the factors influencing survey participation.

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However, a notable difference between the results of the 2 tasks is that the effect sizes for financial incentives on participation in blood tests are about half as large (and occasionally lose significance) compared with the effects on participation in a survey, which are always highly significant (Figure S5 in Multimedia Appendix 1 ).

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