Table 2.

Participants and locations

	Age
Authors	Adolescents (10–24 years old)	Adults (25+ years old)	Boy/girl ratio	Location	N total
Chaput et al 201136	15–19		All boys	Denmark	22
Desai et al 201025	14–18		1845/2139	USA	3984
DiFrancisco-Donoghue et al 201926	18–22		N/A	USA & Canada	65
Exelmans et al 201527	18	94	370/474	Belgium	844
Hellström et al 201528	13–18		3872/3885	Sweden	7757
Scharrer et al 201435	13–15		105/69	Mid-Atlantic states, USA	176
Mario et al 201429	18	27	All boys	United Kingdom	45
Rudolf et al 202033	20	30	980/86	Germany	1066
Smyth et al 200734	18–20		73/27	New York, USA	100
Wallenius et al 200932	12–18		2500/1585	Finland	4085
Weaver et al 200930	19	90	271/291	Seattle, USA	562
Zapata et al 200631	14		376/415	São Paulo, Brazil	791