Statistical details of the VAS ratings of the subjects’ certainty about their judgments of the stimuli at pain threshold level as painful or not: Top: Means and standard deviations of the ratings of the subjects’ certainty about their judgment of threshold CO₂ stimuli as painful or not (“Group 1”: far-from-threshold stimuli randomly announced as “no pain”, “stimulus”, “pain”; “Group 2”: far-from-threshold stimuli correctly announced, i.e. “no pain” and “pain”).

<p>*: The value of </p><p></p><p></p><p></p><p><mi>η</mi></p><p><mi>p</mi></p><mn>2</mn><p></p><p></p><p></p><p></p> multiplied with 100 gives the percentage of variance explained by the respective factor [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0132069#pone.0132069.ref047" target="_blank">47</a>]<p></p><p><b>Bottom:</b> Detailed results of the analyses of variance for repeated measures and the estimates of the respective effect sizes partial eta squared </p><p></p><p></p><p></p><p><mi>η</mi></p><p><mi>p</mi></p><mn>2</mn><p></p><p></p><p></p><p></p>. Results are provided for main effects and interactions, with the F-value followed by the number of degrees of freedom in parentheses and the p-value.<p>