Table 3.
Within-group effect sizes, confidence limits, likelihood effects and odds ratio for performance data.
Variable
Baseline
Post-test
Effect size
Confidence limits
Likelihood effect is beneficial (%)
Likelihood effect is trivial (%)
Likelihood effect is harmful (%)
Effect description
Odd ratio of benefits to harm
Plyometric jump training group (n= 14)
CMJ (cm)
19.7±3.8
21.7±3.7
0.53
-0.1 to 1.2
85.5%
13.0%
1.5%
Likely beneficial
389
SLJ (cm)
134.3±15.7
148.4±13.9
0.95
0.3 to 1.6
90.7%
6.7%
2.6%
Likely beneficial
380
25-m KWP (s)
29.0±2.7
28.4±2.5
0.25
-0.9 to 0.4
63.6%
36.1%
0.4%
Possibly beneficial
487
25-m WP (s)
20.3±1.0
19.7±1.0
0.60
-1.2 to 0.0
87.1%
11.2%
1.7%
Likely beneficial
383
15-m front crawl (s)
10.1±0.5
9.6±0.4
0.99
-1.6 to -0.3
90.9%
6.4%
2.6%
Likely beneficial
369
25-m front crawl (s)
18.2±0.9
17.52±0.7
0.85
-1.5 to -0.2
90.1%
7.6%
2.4%
Likely beneficial
372
50-m front crawl (s)
40.0±1.7
39.1±1.5
0.56
-1.2 to 0.1
86.2%
12.2%
1.6%
Likely beneficial
386
Control group (n=12)
CMJ (cm)
19.9±3.7
19.4±3.0
0.13
-0.8 to 0.5
17.7%
82.2%
0.0%
Likely trivial
526
SLJ (cm)
140.2±27.3
142.7±25.5
0.09
-0.6 to 0.8
2.5%
97.5%
0.0%
Very likely trivial
426
25-m KWP (s)
25.3±2.3
25.2±1.8
0.02
-0.7 to 0.7
0.0%
100.0%
0.0%
Most unlikely trivial
8
25-m front crawl WP (s)
18.6±1.9
18.9±1.7
0.19
-0.5 to 0.9
46.3%
53.5%
0.2%
Possibly trivial
480
15-m front crawl (s)
9.53±0.8
9.3±0.8
-0.36
-1.0 to 0.3
77.9%
21.2%
0.9%
Likely beneficial
400
25-m front crawl (s)
17.17±1.2
16.9±1.4
0.20
-0.9 to 0.5
50.0%
49.8%
0.2%
Possibly beneficial
472
50-m front crawl (s)
37.5±2.8
37.6±4.0
0.04
-0.6 to 0.7
0.0%
100%
0.0%
Most likely trivial
51
CMJ: countermovement jump; SLJ: standing long jump; 25-m KWP: 25-m kick without push; 25-m WP: 25-m front crawl without push.