Several other contrasts appeared numerically large, even though they did not reach statistical significance: Anonymous-Postcard respondents reported more childhood physical abuse ( p = 0.06) and had fewer positive depression screens compared to the other tracking/privacy groups ( p = 0.09), and Confidential respondents reported more combat ( p = 0.09) and had more positive PTSD screens ( p = 0.08).
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Impact of different privacy conditions and incentives on survey response rate, participant representativeness, and disclosure of sensitive information: a randomized controlled trial.
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