Table 2.

Description of TEXTBITES study outcomes and assessments.

Outcome		Assessment
Primary outcome
	BMIa z score	Units BMI is above or below average for the age- and sex-specific reference values measured using calibrated stadiometer and electronic scales [47].
Secondary outcomes
	Waist-to-height ratio	The midway measurement between the iliac crest and lowest rib and height, measured using a non-stretch plastic waist tape and a calibrated stadiometer [47].
	Adherence to dietary guidelines	Short questions adapted from the New South Wales Population Health Survey [48]
	Diet quality, food choices and food patterns	ACAESb Survey [49]
	Physical activity	Validated short physical activity question and study-specific sports participation questions [50]
	Sedentary activity	Modified ASAQc [51-53]
	Objective physical activity	Actigraph GT3X+ activity monitors worn for seven days [54,55]
	Sleep quality	PSQId-Short [56,57]
	Quality of life	PedsQLe Version 4.0 Generic Core Scales questionnaire [58]
	Self-esteem	Rosenberg Self-Esteem Scale [58]
	Self-efficacy	Short questions adapted from the Project Eat Survey II [59]
	Social support	Short questions adapted the social support and eating habits survey [60] and Social Support Scale for Physical Activity [61]
	Eating disorders	EDE-Qf [62]
	Depression	CESDR-10g [63]

^aBMI: body mass index

^bACAES: Australian Child and Adolescent Eating Survey

^cASAQ: Adolescent Sedentary Activity Questionnaire

^dPSQI: Pittsburgh Sleep Quality Index

^ePedsQL: Pediatric Quality of Life Inventory

^fEDE-Q: Eating Disorder Examination questionnaire

^gCESDR-10: Centre for Epidemiological Studies Depression Scale-Revised-10