2 39 REVIEW OF APPLIED & CASUAL GAMES FOR MENTAL HEALTH were identified and recruited within clusters. For crossover trials, we utilised data solely from the first period of the trial (i.e., before participants crossed over to the other intervention; see analytic procedure outlined below). In this scenario, the trial represents a parallel group trial (Higgins, Eldridge, & Li, 2022). Therefore, the main RoB 2.0 tool for individually-randomised parallel-group trials was used for crossover trials. In close contact with the first author, a research assistant and the second author applied the tool to each included study and recorded supporting information and justifications for judgements of risk of bias for each domain (i.e., low risk of bias; some concerns; high risk of bias). Data Extraction and Synthesis A standardised data extraction Excel-sheet was developed, piloted and adapted by the first author and a research assistant, and used to extract the following information from the included papers: 1) background information and 2) statistics. Extraction of background information was done by the first author and included study objective(s), country of research, target group, type of design, total number of participants randomised, gender and age of the sample, number of intervention arms, characteristics of the interventions (such as name, type, content, and information on number, duration, and frequency of sessions), assessment time points (e.g., pre, post, follow-up), variables measured and key findings. Possibly relevant outcome variables were selected by the first author and for each time point, where relevant and available, the following statistics were extracted: mean, standard deviation or standard error, median, (inter)quartiles (range), sample size, change scores, and within-group effect sizes for the separate intervention arms, as well as results from statistical analyses (e.g., t-tests, F-tests) and between-group effect sizes (i.e., Cohen’s d, r, eta square, (un)standardised regression coefficients, and nonparametric equivalents), and notes on the used statistical analyses. As much as possible, intention-to-treat data were extracted. For the second updated search only the directly relevant variables and statistics were extracted. Extraction of the statistics was done by the first author, second author and a research assistant, and independently checked by one of the others, respectively. Weekly meetings with the first author were held to resolve discrepancies and to ensure reliable extraction of future data. When information regarding background information or statistics was insufficient, unclear or missing, inquiries were sent to the corresponding author through e-mail and/or ResearchGate. If needed, reminders were sent, a more recent e-mail address was sought or other study authors were contacted. In case age, gender or mean values and standard
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