Dataset for: Sleep Quality as a Mediator Between Lifestyle and Cognitive and Agentic Student Engagement: A Structural Equation Modeling Approach

## <b>1. Overview</b>This dataset contains the anonymized data collected for the research article titled<i>'Sleep Quality as a Mediator Between Lifestyle and Cognitive and Agentic Student Engagement: A Structural Equation Modeling Approach.'</i> The study aimed to examine the mediating role of sleep quality in the relationship between specific lifestyle factors (diet, physical activity, technology use) and students' cognitive and agentic engagement. Data were collected via an online survey administered between March and April 2024 to a sample of 1065 secondary school students in Italy.## <b>2. Methodology</b>The dataset includes variables measured through several validated instruments and custom questions. Sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI). Cognitive and agentic engagement were measured using subscales from the Student Engagement Scale (SES) by Mameli &amp; Passini (2017). Vigorous physical activity was measured with an item from the International Physical Activity Questionnaire for Adolescents (IPAQ-A). Additional variables related to evening diet and technology use were collected through a custom-designed questionnaire. All data are self-reported and have been anonymized to protect participant privacy. ## <b>3. Data Dictionary</b>The data dictionary is provided in the attached file Final-dataset-grid.csv