ASOMAD	Physical Activity, Sedentarism and Obesity in Madrid Study
BMI	Body mass index
CI	Confidence interval
EPA	Eicosapentaenoic acid
DHA	Docosahexaenoic acid
FFQ	Food-frequency questionnaire
GEE	Generalised estimating equations
HRQoL	Health-related quality of life
KIDMED	Mediterranean Diet Quality Index in children and adolescents
KIDMED_wo_FV	KIDMED score excluding the fish and vegetable items
LC n-3 PUFA	Long-chain n-3 polyunsaturated fatty acids
MVPA	Moderate-to-vigorous physical activity
OR	Odds ratio
PAU-7S	Physical Activity Unit 7-item Screener
SD	Standard deviation
SES	Socioeconomic status
SSBQ	Screen-based Sedentary Behaviour Questionnaire
STROBE	Strengthening the Reporting of Observational Studies in Epidemiology
WHtR	Waist-to-height ratio