Table 2.

Summary of the main quantitative findings, including the number of studies and effect sizes per analysis

Analysis	Role in manuscript	Model	Effect metric	Studies / effect sizes (k/n)	Participants (Exp/Control)	Pooled effect	95% CI	P value	Heterogeneity (I²)
CMJ-only	Primary analysis	Fixed-effect	MD (cm)	8 / 8	110 / 86	2.41	1.20 to 3.61	< 0.0001	26%
CMJ-only (leave-two-out: excluding Krzysztofik [12] and Villalon-Gasch [30])	Sensitivity analysis	Fixed-effect	MD (cm)	6 / 6	85 / 68	1.95	0.69 to 3.21	0.003	0%
CMJ-only (SMD sensitivity analysis)	Sensitivity analysis	Random-effects	SMD	8 / 8	110 / 86	0.52	0.23 to 0.82	0.0005	0%
All jump outcomes	Supplementary analysis	Random-effects	SMD	10 / 10	139 / 115	0.42	0.17 to 0.68	0.001	0%
Sprint	Secondary exploratory analysis	Random-effects	SMD	3 / 3	41 / 35	0.29	-0.35 to 0.94	0.37	49%
Change-of-direction (COD)	Secondary exploratory analysis	Random-effects	SMD	3 / 3	47 / 47	-0.75	-1.17 to -0.33	0.0005	0%