Table 2

Summary of the outcome assessments and assessment time points

Variables	Measurement	Screening	T0	T1	T2
Inclusion and exclusion criteria
Demographic variables	Eg, age, enrolled in a university, internet access, current participation in a mindfulness intervention	X
Freiburg Mindfulness Inventory-short form	Mindfulness	X
Primary Outcome
Freiburg Mindfulness Inventory-short form	Mindfulness		X	X	X
Secondary Outcomes
Patient Health Questionnaire	Depression		X	X	X
Generalized Anxiety Disorder Questionnaire	Anxiety		X	X	X
Perceived Stress Scale-short form	Stress		X	X	X
WHO Well-Being Index	Well-being		X	X	X
Body Perception Questionnaire	Interoceptive sensibility		X	X	X
Emotion Regulation Questionnaire	Reappraisal and suppression		X	X	X
Toronto Alexithymia Scale	Alexithymia		X	X	X
Heartbeat perception task	Interoceptive accuracy		X	X	X
Cortisol and DHEA	Psychobiological stress level		X	X	X
Covariates
Demographic variables	Eg, weight, height, psychotherapy		X
Previous experience with mindfulness, time spent practising mindfulness and use of additional treatment options	Self-reported mindfulness and treatment experience		X	X	X
Genotype FKBP5 (rs1360780)	Gen x environment interaction		X
Client Expectancy Questionnaire	Treatment expectancy and rationale credibility		X
Dropout	Intervention adherence		X	X
Client Satisfaction Questionnaire	Intervention satisfaction			X*
Inventory for the Assessment of Negative Effects	Potential adverse effect			X*