Fig. 3.

Main data set. Means of myth agreement (post-intervention) as a function of baseline agreement (pre-intervention), correction format and timepoint e.g., responses at timepoint 1 in the question-answer condition that were 2 at baseline (pre-intervention) had an average of 1.5 post-intervention. N’s indicate the number of responses in each data point e.g., there were 3505 responses that had baseline 2. No N’s are included for timepoint 2 because the same number of responses were used for timepoint 1 and timepoint 2. Dashed line shows equivalence between baseline and myth agreement (post-intervention) so that data below the line indicates correction. In both timepoints there was a strong positive correlation between baseline agreement and post-intervention agreement (post-intervention agreement was high when baseline agreement was high). Differences between correction formats were more apparent at higher levels of baseline agreement than at lower levels, hence interactions between baseline and correction format. At timepoint 1, no differences between correction formats were visible when baseline was low, but at higher levels fact-only was less effective at lowering agreement than question-answer or fact-myth (p = .022). At timepoint 2, again no differences were visible at low baselines, but fact-myth was less effective than question-answer when baseline was very high (p = .031)