Table 3.

Effects of strength training on SJ height considering different moderating variables.

Independent variables	SMD	SE	95 % CI	P	I2 (%)	df	Q-value and (p) between groups
SEX
Males	0.89	0.32	0.27–1.51	0.005	71.97**	8	2.55 (0.111)
Males and females	0.07	0.40	−0.72–0.86	0.855	0.0	0
AGE OF ATHLETES
Adolescents	0.95	0.28	0.40–1.50	0.001	65.22**	7
Children	−0.54	0.46	−1.44–0.35	0.232	0.0	0	7.76 (0.005)
TRAINING DURATION
≤ 8 weeks	0.64	0.36	−0.08–1.35	0.082	68.71*	5
> 8 weeks	1.07	0.54	0.02–2.12	0.046	79.60**	3	0.45 (0.501)
WEEKLY TRAINING FREQUENCY
2 per week	0.74	0.32	0.12–1.37	0.019	72.64**	8	0.96 (0.328)
3 per week	1.28	0.45	0.40–2.16	0.004	0.0	0
INTENSITY
Moderate	1.28	0.45	0.40–2.16	0.004	0.0	0	1.02 (0.601)
Moderate to high	1.06	0.52	0.05–2.08	0.041	0.0	0
High	0.64	0.46	−0.27–1.55	0.169	78.93**	4
NUMBER OF SETS PER EXERCISE
3	0.97	0.51	−0.02–1.96	0.056	80.22	4
4	0.73	0.46	−0.17–1.64	0.110	71.19	3	0.73
5	0.40	0.45	−0.49–1.29	0.383	0.0	0	(0.694)
NUMBER OF REPETITIONS PER SET
4	0.77	0.44	−0.10–1.63	0.083	0.00	0	14.63 (0.012)
5	2.17	0.56	1.06–3.27	<0.001	0.0	0
6	0.07	0.40	−0.72–0.86	0.855	0.00	0
10	−0.04	0.50	−1.02–0.93	0.928	0.00	1
11	1.28	0.45	0.40–2.16	0.004	79.01	0
12	1.96	0.95	0.09–3.83	0.040	0.0	1

CI, confidence interval; I², index of heterogeneity; df, degrees of freedom; SD, standard deviation; SMD, standardized mean differences; p significance level,

^*p < 0.05,

^**p < 0.01. Bold values indicate statistically significant values.