Breda, JoãoMcColl, KarenBuoncristiano, MartaWilliams, JulianneAbdrakhmanova, ShynarAbdurrahmonova, ZulfiyaAhrens, WolfgangAkhmedova, DiloromBakacs, MártaBoer, Jolanda M.A.Boymatova, KhadichamoBrinduse, Lacramioara AureliaCucu, AlexandraDuleva, VesselkaEndevelt, RonitSant'Angelo, Victoria FarrugiaFijałkowska, AnnaHadžiomeragić, Aida FilipovićGarcía‐Solano, MartaGrøholt, Else KarinGualtieri, AndreaHassapidou, MariaHejgaard, TatjanaHyska, JolandaKelleher, Cecily C.Kujundžić, EnisaMäki, PäiviMarkidou Ioannidou, ElizaMelkumova, MarinaMoyersoen, IsabelleMilanović, Sanja MusićNurk, EhaOstojic, Sergej M.Peterkova, ValentinaPetrauskienė, AušraPudule, IvetaRito, Ana IsabelRussell Jonsson, KenishaRutter, HarrySalanave, BenoîtSeyidov, NabilShengelia, LelaSilitrari, NataliaSpinelli, AngelaSpiroski, IgorStarc, GregorStojisavljević, DraganaTanrygulyyeva, MayaTichá, ĽubicaUsupova, ZhamilyaWeghuber, DanielYardim, NazanZamrazilová, HanaZbanatskyi, VladyslavBranca, FrancescoWeber, MartinRakovac, Ivo2022-02-142022-02-142021-11-04Obes Rev. 2021 Nov;22(Suppl 6):e13215. doi: 10.1111/obr.13215. Epub 2021 Nov 4.1467-7881http://hdl.handle.net/10400.18/7945Establishment of the WHO European Childhood Obesity Surveillance Initiative (COSI)has resulted in a surveillance system which provides regular, reliable, timely, andaccurate data on children's weight status—through standardized measurement ofbodyweight and height—in the WHO European Region. Additional data on dietaryintake, physical activity, sedentary behavior, family background, and schoolenvironments are collected in several countries. In total, 45 countries in the EuropeanRegion have participated in COSI. The first five data collection rounds, between 2007and 2021, yielded measured anthropometric data on over 1.3 million children. In COSI,data are collected according to a common protocol, using standardized instrumentsand procedures. The systematic collection and analysis of these data enables inter-country comparisons and reveals differences in the prevalence of childhood thinness,overweight, normal weight, and obesity between and within populations. Furthermore,it facilitates investigation of the relationship between overweight, obesity, and poten-tial risk or protective factors and improves the understanding of the development ofoverweight and obesity in European primary-school children in order to supportappropriate and effective policy responses.engChildrenMethodologyObesitySurveillanceEuropean Childhood Obesity Surveillance InitiativeCOSIWorld Health OrganizationEuropeEstilos de Vida e Impacto na SaúdePortugaljournal article10.1111/obr.13215