Table 2 Quantitative data collection of the Healthy High School study
Key measures | Operationalization | Instrument | Timing of collection* | Data source |
|---|---|---|---|---|
PRIMARY OUTCOME | ||||
Well-being | WHO-Five Well-Being Index, Cantril Ladder of Life Scale | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
SECONDARY OUTCOMES | ||||
 Stress | 10-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 |
 Sleep | Sleep quantity, sleep quality | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
 PA | Hours 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 behaviour | Hours of daily sedentary time | Web-based questionnaire; accelerometer | Baseline, 1st follow-up and 2nd follow-up; baseline, 1st follow-up | Students; subsample of students |
 Meal habits | Daily intake of breakfast, lunch and water | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
 Sense of community | High 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** | ||||
 Knowledge | Knowledge of stress, national dietary guidelines, PA guidelines and sleep recommendations | Web-based questionnaire | 1st follow-up | Students |
 Awareness | Awareness of whether they meet national dietary guidelines, PA guidelines and sleep recommendations, and of own stress symptoms | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
 Self-efficacy | General self-efficacy | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
 Outcome expectations | Perceived effects of PA, sleep, eating breakfast/lunch, e.g. more energy, stress relief, better sleep | Web-based questionnaire | Baseline, 1st follow-up | Students |
 Skills | Time management skills, stress management | Web-based questionnaire | Baseline, 1st follow-up | Students |
 Perceived barriers and facilitators | Barriers and motivation for PA and eating regular meals | Web-based questionnaire | Baseline, 1st follow-up | Students |
 Perfectionism | Concern over mistakes, personal standards | Web-based questionnaire | Baseline, 1st follow-up | Students |
INTERPERSONAL DETERMINANTS | ||||
 Peer- and school staff influence | Social norms, social support | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students, school administrators |
ORGANISATIONAL DETERMINANTS | ||||
 Environmental conditions at school and local community | Physical, economical, political and structural | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | School administrators |
POTENTIAL POSITIVE SIDE EFFECTS | ||||
 Healthy weight development | Body mass index determined from weight and height | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
 Energy for academic achievement | Maintenance of energy during the school day | Web-based questionnaire | Baseline, 1st follow-up | Students |
 Maintain concentration throughout the school day | Morning and afternoon concentration | Web-based questionnaire | Baseline, 1st follow-up | Students |
Decrease in school absence | The number of school days missed due to absence the past 30 days | Web-based questionnaire | 2nd follow-up | Students |
 Decrease in intake of unhealthy food & drinks | Intake of soft drinks, energy drinks and unhealthy snacks | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
POTENTIAL UNINTENDED ADVERSE EFFECTS | ||||
Negative body image | Negative body perception, body weight dissatisfaction | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
 Sports injuries | Sport injuries the past 6 months | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
Dieting | Dieting the past 6 months | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
MODERATORS | ||||
 Gender | Boy/girl | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
 Socioeconomic position | Family occupational class, parental education | Web-based questionnaire | Baseline, 1st follow-up and 2nd follow-up | Students |
IMPLEMENTATION | ||||
 Implementation measures | Dose (delivered and received), fidelity, appreciation, acceptability, context | Web-based questionnaire | 1st follow-up | Students, teachers, school administrators |