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2.1.2. Criteria for inclusion and coder reliability 

The primary metric of interest in this study was the Pearson correlation coefficient between measures of curiosity and interest. Studies were included if they 1) had at least one quantitative measure of curiosity and at least one quantitative measure of interest; and 2) reported at least one correlation (r) between any measure of curiosity and any measure of interest, or appeared to have such correlations. Experimental and quasi-experimental studies were included as long as at least one correlation between curiosity and interest was reported either at the pretreatment time-point or at the post-treatment time-point. Case studies (sample size of one), qualitative, and single-case designs were excluded from the current meta-analysis. After a screening of the 2963 publications abstracts based on the above-mentioned criteria, a total of 67 publications appeared to meet inclusion criteria. A full-text review was conducted of these articles and a further 43 publications were excluded as they did not meet the inclusion criteria. Most commonly, articles were excluded because they did not report correlations between measures of curiosity and interest or the authors could not be reached for further clarification. Not all publications provided sufficient information related to the variables of interest. In case of insufficient information, we contacted the corresponding author of the paper with a request for the correlation coefficient. In the end, our final sample included 24 studies, 31 effect sizes, and a total of 4817 participants (ns ranging from 15 to 646). The full citation list for all included articles can be found in the online supplemental materials.

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