Table 2

Details of study participants demographics and whether data were provided

AuthorYearJournalIntervention group ageComparator group ageIntervention group sexComparator group sex
Biernat et al 11 2014 J Strength Cond Res 17.2 (0.6)16.5 (0.8)All maleAll male
Cannell et al 16 2001 Br J Sports Med No response from author within time limit
Jonsson et al 14 2005 Br J Sports Med Author confirmed age specific data not obtainable
Topol, et al 9 2011 P ediatrics 13.3 (range 10–17)51 boys and three girls
Trail et al 10 1988 J Pediatr Orthop 13 years 9 months (range 11–17)12 years 7 months (range 10–17)Not statedNot stated
Wang et al 12 2007 Am J Sports Med Author confirmed no participants under age 18 took part in the study (note study did state age range lower limit was 16)
Willberg et al 15 2011 Br J Sports Med No response from author within time limit
Van Ark et al 13 2016 J Sci Med Sport Only one under 18 year old participant took part hence study excluded from data analysis