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Table 2 Quantitative data collection of the Healthy High School study

From: Study protocol of the Healthy High School study: a school-based intervention to improve well-being among high school students in Denmark

Key measuresOperationalizationInstrumentTiming of collection*Data source
PRIMARY OUTCOME
Well-beingWHO-Five Well-Being Index, Cantril Ladder of Life ScaleWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
SECONDARY OUTCOMES
 Stress10-item Perceived Stress Scale
Stress intensity, stress frequency
Web-based questionnaire
Web-based questionnaire;text-messages
Baseline, 1st follow-up and 2nd follow-up
Baseline, 1st follow-up and 2nd follow-up; once a month from September 2016–June 2017
Students
Students; subsample of students
 SleepSleep quantity, sleep qualityWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
 PAHours of moderate-to-vigorous PA per week
Average daily PA
Web-based questionnaire
Accelerometer
Baseline, 1st follow-up and 2nd follow-up
Baseline, 1st follow-up
Students
Subsample of students
 Sedentary behaviourHours of daily sedentary timeWeb-based questionnaire; accelerometerBaseline, 1st follow-up and 2nd follow-up; baseline, 1st follow-upStudents; subsample of students
 Meal habitsDaily intake of breakfast, lunch and waterWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
 Sense of communityHigh school sense of community
School class sense of community
Web-based questionnaire
Web-based questionnaire
Baseline, 1st follow-up and 2nd follow-up
1st follow-up and 2nd follow-up
Students
Students
PROXIMAL OUTCOMES
INDIVIDUAL DETERMINANTS**
 KnowledgeKnowledge of stress, national dietary guidelines, PA guidelines and sleep recommendationsWeb-based questionnaire1st follow-upStudents
 AwarenessAwareness of whether they meet national dietary guidelines, PA guidelines and sleep recommendations, and of own stress symptomsWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
 Self-efficacyGeneral self-efficacyWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
 Outcome expectationsPerceived effects of PA, sleep, eating breakfast/lunch, e.g. more energy, stress relief, better sleepWeb-based questionnaireBaseline, 1st follow-upStudents
 SkillsTime management skills, stress managementWeb-based questionnaireBaseline, 1st follow-upStudents
 Perceived barriers and facilitatorsBarriers and motivation for PA and eating regular mealsWeb-based questionnaireBaseline, 1st follow-upStudents
 PerfectionismConcern over mistakes, personal standardsWeb-based questionnaireBaseline, 1st follow-upStudents
INTERPERSONAL DETERMINANTS
 Peer- and school staff influenceSocial norms, social supportWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents, school administrators
ORGANISATIONAL DETERMINANTS
 Environmental conditions at school and local communityPhysical, economical, political and structuralWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upSchool administrators
POTENTIAL POSITIVE SIDE EFFECTS
 Healthy weight developmentBody mass index determined from weight and heightWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
 Energy for academic achievementMaintenance of energy during the school dayWeb-based questionnaireBaseline, 1st follow-upStudents
 Maintain concentration throughout the school dayMorning and afternoon concentrationWeb-based questionnaireBaseline, 1st follow-upStudents
Decrease in school absenceThe number of school days missed due to absence the past 30 daysWeb-based questionnaire2nd follow-upStudents
 Decrease in intake of unhealthy food & drinksIntake of soft drinks, energy drinks and unhealthy snacksWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
POTENTIAL UNINTENDED ADVERSE EFFECTS
Negative body imageNegative body perception, body weight dissatisfactionWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
 Sports injuriesSport injuries the past 6 monthsWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
DietingDieting the past 6 monthsWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
MODERATORS
 GenderBoy/girlWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
 Socioeconomic positionFamily occupational class, parental educationWeb-based questionnaireBaseline, 1st follow-up and 2nd follow-upStudents
IMPLEMENTATION
 Implementation measuresDose (delivered and received), fidelity, appreciation, acceptability, contextWeb-based questionnaire1st follow-upStudents, teachers, school administrators
  1. PA = physical activity. *Baseline (August 2016), 1st follow-up (May 2017), 2nd follow-up (April 2018). ** Determinants are measured for all primary and secondary outcomes. These determinants will be described in detail in future articles
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