Screen Culture's Impact on Generation Z Adolescents' Physical Activity, Posture and Well-being in Egypt

• BMI Measurement (Diagnostic test): BMI Measurement: Self-report height/weight (compared with age/sex standard BMI percentiles).
• Screen Time Questionnaire (QUEST) (Diagnostic test): Screen Time Questionnaire (QUEST): Assess length, purpose, and pattern of device use.
• Insomnia Severity Index (ISI) (Diagnostic test): Insomnia Severity Index (ISI): 7-item sleep disturbance severity measure (score range: 0-28).
• Q-BAPHYP (Diagnostic test): Q-BAPHYP: 20-item scale measuring body awareness, postural habits, and ergonomic behaviors.
• PedsQL™ (Diagnostic test): PedsQL™: Pediatric Quality of Life Inventory

Primary outcomes

• sleep disturbance severity [1 day]: Scale Used: Insomnia Severity Index (ISI) Description: The ISI is a 7-item self-report questionnaire that assesses the severity of insomnia and its impact on daily functioning. Each item is scored on a 0-4 scale, with total scores ranging from 0 to 28. Higher scores indicate more severe sleep disturbance.
• body awareness [1 Day]: Scale Used: Q-BAPHYP Description: The body awareness component of the Q-BAPHYP scale assesses an individual's awareness of their body position, movement, and physical sensations. It may include items related to: Recognition of poor posture Awareness of physical discomfort during screen use Sensitivity to bodily signals (e.g., fatigue, muscle tension) Attention to ergonomic positioning
• Pediatric Quality of Life [1 Day]: Scale Used: PedsQL™ (Pediatric Quality of Life Inventory) Description: The PedsQL™ is a modular instrument designed to measure health-related quality of life in children and adolescents. It covers multiple dimensions of well-being across: Physical Functioning (e.g., ability to engage in physical activities) Emotional Functioning (e.g., feeling anxious or sad) Social Functioning (e.g., interactions with peers) School Functioning (e.g., ability to concentrate and attend school)

Secondary outcomes

• Postural Habits [1 Day]: The body awareness component of the Q-BAPHYP scale assesses an individual's awareness of their body position, movement, and physical sensations

Sex: All, ages: 13 Years to 18 Years, accepts healthy volunteers

Inclusion Criteria:

* Age: 13-18 years (adolescence as per WHO standards).
* Nationality: Egyptian residents.
* Language Proficiency: Ability to read and comprehend English (the questionnaires are in English).
* Screen Use: ≥1 screen device used frequently (e.g., smartphone, laptop, tablet).

Exclusion Criteria:

* Can not o read and comprehend English language Do not have a routine of a screen time

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