Table 1 Study characteristics and descriptive characteristics of participants stratified by study.

Study	Country, city/area	Year	n (% boys)	Age, years	BMI, kg/m²	>Compulsory education, (%)^a
ALSPAC	UK, Avon	2006–2008	2110 (45.1%)	15.4 (15.3–15.6)	21.4 (3.6)	89.6
Denmark EYHS	Denmark,Odense	1997–2010	1438 (44.0%)	10.2 (9.6—15.5)	18.9 (3.3)	88.7
Estonia EYHS	Estonia, Tartu	1998–1999	568 (44.2%)	10.2 (9.5–15.4)	18.4 (3.0)	81.2
IBDS	US, Iowa	2003–2005	431 (48.0%)	11.0 (10.9–11.3)	20.0 (4.4)	86.3
Norway EYHS	Norway, Oslo	1999–2000	236 (50.8%)	9.7 (9.4–10.0)	16.9 (2.2)	58.5
Pelotas	Brazil, Pelotas	2006–2007	426 (52.8%)	13.3 (13.1–13.6)	20.3 (3.8)	23.5
Portugal EYHS	Portugal,Madeira	1999–2000	590 (51.5%)	10.0 (9.6–15.4)	19.4 (3.7)	6.5
SPEEDY	UK, Norfolk	2011	358 (45.5%)	14.3 (14.0–14.5)	20.8 (3.9)	68.1
KISS	Switzerland^b	2005–2006	306 (45.8%)	10.4 (7.1–11.2)	17.3 (2.8)	92.7
MoBa	Norway^c	2013–2015	430 (54.4%)	11.0 (10.3–11.3)	17.8 (2.4)	96.9
ASK	Norway^d	2014	857 (51.6%)	10.2 (10.0–10.5)	18.1 (3.1)	97.9
PANCS	Norway^e	2005–2006	1350 (49.9%)	9.8 (9.5–15.3)	18.6 (3.3)	94.8

Data are expressed as mean (SD) for BMI, median (25th–75th percentile) for age, number of participants (n), percent boys (%) and percent >compulsory education.
ALSPAC Avon Longitudinal Study of Parents and Children, ASK Active Smarter Kids, BMI body mass index, EYHS European Youth Heart Study, IBDS The Iowa Bone Development Study, KISS The Kinder-Sportstudie, MoBa the Norwegian Mother, Father and Child Cohort Study, PANCS Physical Activity Among Norwegian Children Study, SPEEDY Sport, Physical Activity and Eating Behavior: Environmental Determinants in Young People Study.
^aPercent (%) of which one or both parents have completed any post-compulsory education.
^bTwo provinces in Switzerland.
^cFour cities in Norway (Oslo, Fredrikstad, Stavanger, and Bergen).
^dSogn and Fjordane county.
^eRepresentative sample from all regions in Norway.

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