TABLE 3.

Summary of findings (SoF) and quality of evidence (GRADE) for core training.

Certainty assessment							№ of patients		Effect		Certainty	Importance
№ of studies	Study design	Risk of bias	Inconsistency	Indirectness	Imprecision	Other considerations	core training	CG	Relative (95% CI)	Absolute (95% CI)
Balance
6	randomised trials	not serious	seriousa	not serious	not serious	none	75	67	-	SMD 1.17 SD higher (0.56 higher to 1.77 higher)	⨁⨁⨁◯ Moderate	IMPORTANT
Vertical Jump
11	randomised trials	not serious	seriousb	not serious	not serious	none	171	162	-	SMD 0.69 SD higher (0.32 higher to 1.06 higher)	⨁⨁⨁◯ Moderate	IMPORTANT
Horizontal jump
5	randomised trials	not serious	very seriousc	not serious	not serious	none	171	161	-	SMD 0.84 SD higher (0.16 higher to 1.52 higher)	⨁⨁◯◯ Low	IMPORTANT
Velocity throw
7	randomised trials	not serious	seriousd	not serious	seriouse	none	110	110	-	SMD 0.3 SD higher (0.1 lower to 0.71 higher)	⨁⨁◯◯ Low	IMPORTANT
Distance throw
3	randomised trials	not serious	very seriousf	not serious	not seriousg	none	65	64	-	SMD 3.42 SD higher (0.35 higher to 6.49 higher)	⨁⨁◯◯ Low	IMPORTANT

CI: confidence interval; SMD: standardised mean difference. Explanations:

^a. The heterogeneity between studies was substantial (I² = 61%);

^b. The heterogeneity between studies was substantial (I² = 62%);

^c. The heterogeneity between studies was considerable (I² = 85%);

^d. The heterogeneity between studies was substantial (I² = 53%);

^e. Requires a total sample size of approximately 220;

^f. The heterogeneity between studies was considerable (I² = 97%);

^g. The confidence interval are large (0.35–6.49)