Informing potential participants about research: observational study with an embedded randomized controlled trial.

PLoS One · 2013 · PMC3789820 · PMID 24098499

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showed a trendno p-value reported

The booking rates showed a trend towards increased booking in those contacted by email (odds ratio 1.25, 95% CL 1.0-1.7); the highest booking rate was observed in the no PIS group ( Figure 1 ).

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