Table 4.

Results of the multivariate random-effect meta-regression for training variables to predict plyometric jump training effects on vertical jump performance^a in basketball players.

Covariate	Coefficient	95%CI	Z	p
Countermovement jump height (n = 21)
Intercept	0.448	−3.557 to 4.455	0.22	0.826
Training duration	−0.008	−0.407 to 0.389	−0.04	0.966
Frequency	0.097	−1.801 to 1.999	0.10	0.920
Total sessions	0.015	−0.192 to 0.224	0.15	0.881
Countermovement jump with arm swing height (n = 12)
Intercept	−0.397	−8.252 to 7.457	−0.10	0.921
Training duration	0.005	−0.663 to 0.674	0.02	0.987
Frequency	0.961	−2.989 to 4.913	0.48	0.633
Total sessions	−0.028	−0.404 to 0.348	−0.15	0.883
Squat jump height (n = 12)
Intercept	4.223	−0.039 to 8.487	1.94	0.052
Training duration	−0.393	−0.815 to 0.029	−1.82	0.068
Frequency	−2.439	−4.910 to 0.030	−1.94	0.052
Total sessions	0.287	−0.011 to 0.562	2.04	0.040

Notes: n means number of study groups. Bolded p values mean significant (p < 0.05) prediction effect of plyometric jump training on jumping performance.

^aComputation of meta-regression was performed with at least 10 studies per covariate, available only for countermovement and squat jump performance from the investigated fitness variables.

Abbreviation: 95%CI = 95% confidence interval.