To establish normative performance values for the modified Star Excursion Balance Test (mSEBT) and derived Limb Symmetry Index (LSI) scores in non-injured female adolescent footballers, to and identity whether there is a relationship between the aforementioned metrics and age. Single measure study design. A single football club's female regional talent and development teams. Thirty-four uninjured female footballers, aged between 13 and 18 years. MSEBT and derived LSI scores. There were no statistically significant differences between dominant and non-dominant leg distance scores in any of the mSEBT specific reach direction or composite scores. Across all age groups, mean dominant leg total distance scores ranged from 231.5 to 250.4 cm while non-dominant total distance scores ranged from 234.3 to 253.3 cm. Mean LSI values ranged from 97.8% to 100.5%. Age accounted for approximately 8% of the variance within dominant, non-dominant total distance, and LSI scores. Our study has established normative performance values for the mSEBT and derived LSI scores in non-injured female adolescent footballers. Age had a very limited ability in accounting for the variance observed for composite scores in dominant, non-dominant, and LSI-based scores.
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