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Table 3. Means, standard deviations and intra-class-correlation coefficients of outcome variables.
    PLS with subheading PLS without subheading ordinary scientific abstract 
Outcome  Scale ICCParticipants ICCStudy M SD M SD M SD 
Comprehensibility 1 to 8, semantic differential .178 .182 6.203 1.651 5.964 1.791 5.443 1.980 
Credibility 1 to 8, semantic differential .339 .042 5.368 1.584 5.199 1.646 5.193 1.611 
Ability to evaluate 1 to 8, Likert scale .511 .020 3.703 1.829 3.511 1.843 3.468 1.857 
Ability to make a decision 1 to 8, Likert scale .442 .016 3.103 1.755 2.783 1.717 2.767 1.695 
Curiosity 1 to 5, Likert scale .246 .077 2.950 1.152 2.885 1.210 2.627 1.158 
Boredom 1 to 5, Likert scale .263 .070 1.674 0.936 1.759 0.969 1.779 0.984 
Confusion 1 to 5, Likert scale .189 .115 1.602 0.855 1.738 0.951 1.997 1.098 
Frustration 1 to 5, Likert scale .283 .040 1.410 0.775 1.531 0.921 1.611 0.981 
N  1947 1947 620 620 663 663 664 664 
    PLS with subheading PLS without subheading ordinary scientific abstract 
Outcome  Scale ICCParticipants ICCStudy M SD M SD M SD 
Comprehensibility 1 to 8, semantic differential .178 .182 6.203 1.651 5.964 1.791 5.443 1.980 
Credibility 1 to 8, semantic differential .339 .042 5.368 1.584 5.199 1.646 5.193 1.611 
Ability to evaluate 1 to 8, Likert scale .511 .020 3.703 1.829 3.511 1.843 3.468 1.857 
Ability to make a decision 1 to 8, Likert scale .442 .016 3.103 1.755 2.783 1.717 2.767 1.695 
Curiosity 1 to 5, Likert scale .246 .077 2.950 1.152 2.885 1.210 2.627 1.158 
Boredom 1 to 5, Likert scale .263 .070 1.674 0.936 1.759 0.969 1.779 0.984 
Confusion 1 to 5, Likert scale .189 .115 1.602 0.855 1.738 0.951 1.997 1.098 
Frustration 1 to 5, Likert scale .283 .040 1.410 0.775 1.531 0.921 1.611 0.981 
N  1947 1947 620 620 663 663 664 664 

Note:M = arithmetic mean; SD = standard deviation; ICC = intra-class-correlation coefficient; PLS = plain language summary.

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