Adolescents’ Usage of Digital Fitness Equipment

Each row represents one participant’s record at a specific experimental wave.Row‑level identifierid: Unique identifier for each adolescent participant. Multiple rows share the same id across different waves, reflecting repeated measurements for the same individual.wave: Experimental wave indicator (nine‑wave longitudinal design), denoting the measurement round of data collection.Between‑subject manipulated experimental variables (fixed per participant)gamification: Experimental condition for gamification feature (low / high level, between‑subject manipulation)anthropomorphism: Experimental condition for anthropomorphism feature (low / high level, between‑subject manipulation)intelligence: Experimental condition for intelligent design feature (low / high level, between‑subject manipulation)Demographic and baseline control variables (time‑invariant, one value per individual)gender: Participant’s genderage: Participant’s chronological agebmi: Body‑mass indexbaseline_pa: Baseline physical‑activity frequencygaming_experience: Self‑reported gaming experienceai_familiarity: Familiarity with AI‑related productsexercise_self_efficacy: Pre‑experiment exercise self‑efficacyexercise_interest: Pre‑experiment interest in physical exercisePerception latent variables: item‑level indicators and composite scoresSuffix _1/_2/_3 denote individual scale items; variables without suffix represent computed composite scores.perceived_usefulness_1, perceived_usefulness_2, perceived_usefulness_3: Three measurement items for perceived usefulnessperceived_usefulness: Composite score of perceived usefulnessperceived_enjoyment_1, perceived_enjoyment_2, perceived_enjoyment_3: Three measurement items for perceived enjoymentperceived_enjoyment: Composite score of perceived enjoymentusage_intention_1, usage_intention_2, usage_intention_3: Three measurement items for usage intentionusage_intention: Composite score of usage intentionOutcome variableusage_duration: Single‑session exercise usage duration for each observation waveManipulation‑check variables: item‑level indicators and composite scoresSuffix _1/_2/_3 denote individual manipulation‑check items; variables without suffix represent composite scores.manipulation_gamification_1, manipulation_gamification_2, manipulation_gamification_3: Manipulation‑check items for gamificationmanipulation_gamification: Composite manipulation‑check score for gamificationmanipulation_anthropomorphism_1, manipulation_anthropomorphism_2, manipulation_anthropomorphism_3: Manipulation‑check items for anthropomorphismmanipulation_anthropomorphism: Composite manipulation‑check score for anthropomorphismmanipulation_intelligence_1, manipulation_intelligence_2, manipulation_intelligence_3: Manipulation‑check items for intelligent designmanipulation_intelligence: Composite manipulation‑check score for intelligent design