Table 1.

List of included studies

Year	Organization	Focus	Psychological Development/Approach					Physical Development/Load				Facilities/Resources			Timing and Monitoring of Specialization
			1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
2000 7	AAP a	Sport specialization											×			×	×
2007 2	AAP b	Overtraining/overuse				×					×	×			×		×
2008 21	AAFP, AAOS, ACSM, AMSSM, AOSSM, AOASM	Adolescent athlete									×	×
2008 17	IOC	Adolescent athlete					×	×			×		×	×			×
2011 23	NATA	Overtraining/overuse, injury prevention								×	×	×	×			×	×
2013 16	ACSM, ECSS	Overtraining/overuse										×	×
2014 5	AMSSM	Burnout			×			×		×	×	×	×		×	×
2015 1	IOC	Athlete development			×	×	×	×		×		×	×			×	×
2016 3	AAP c	Sport specialization		×	×		×				×	×	×		×	×	×
2016 11	NSCA	Athlete development		×			×	×	×	×	×		×			×	×
2016 10	AOSSM	Sport specialization						×	×	×						×	×

AAFP, American Association of Family Practitioners; AAP, American Association of Pediatrics; AAOS, American Association of Orthopedic Surgeons; ACSM, American College of Sports Medicine; AMSSM, American Medical Society for Sports Medicine; AOASM, American Osteopathic Academy of Sports Medicine; AOSSM, American Orthopaedic Society for Sports Medicine; ECSS, European College of Sport Science; IOC, International Olympic Committee; NATA, National Athletic Trainers’ Association; NCSA, National Strength and Conditional Association.

^aReaffirmed by the AAP in February 2015.

^bReaffirmed by the AAP in September 2014.

^cReplaces statement by the AAP from 2000.