From: Randomised controlled trial of improvisational music therapy's effectiveness for children with autism spectrum disorders (TIME-A): study protocol
Raw difference on the ADOS scale (SD = 5)
Standardised effect size (Cohen's d)
Power at first interim look1
Test power over all 4 interim looks2
2.5
0.5 (medium effect)
93%
100%
2
0.4
76%
1.5
0.3
47%
99%
1
0.2 (small effect)
20%
80%