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Association between Recruitment Methods and Attrition in Internet-Based Studies

Figure 2

Summary of the results reported in Table 2.

The effect of online recruitment on follow-up participation compared to offline recruitment is shown. Given that the studies are highly heterogeneous by design and target different populations, the pooled estimate should be considered as an average of the study-specific effects rather than as a causal estimate.

Figure 2

doi: https://doi.org/10.1371/journal.pone.0114925.g002