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Cohen's D: mean difference calculated as post measure minus pre measure divided by standard deviation.
Scores on the post measure went down slightly (0.25 to 0.50) for eight course participants.
Pre measure of confidence and post measure of confidence were significantly correlated with most measures of knowledge; although, a number of these correlations were small (Table 4).
For the pre knowledge measure, the Cronbach's alpha was 0.62 and post measure Cronbach's alpha was 0.58 (Table 3 and for pre and post scores see Additional file 1, Additional file 2, Additional file 3 and Additional file 4).
Another weakness of the COI approach is that it is an ex post measure of costs and it does not consider the value that individuals give to possible risk reduction interventions [ 27].
This is the difference between the change score of the Group 1 mean of 14.200 (SD = 7.2 assuming a correlation between pre and post measure of r = 0.5) and the Group 2 mean of 5.200 (SD = 9.05, assuming a correlation between pre and post of r = 0.5).
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We conducted a retrospective study, with pre and post measures due to the implementation.
Figure 2 presents distributions for the BBC and the Polish fora data, with the length of the post measured in words, which are more 'human' units.
For the statistical comparisons we used the difference between the Pre and the Post measures and expressed these as percent change from the Pre measures.
We compared the pre versus the post measures and the corresponding time period for the baseline condition using repeated measures ANOVA.
2. Primary analysis will be undertaken using a repeated measures ANOVA (baseline; post measures).
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