A paragraph discussing power calculations for negative results might be also appropriate for this manuscript. (eneuro.org)
The participants were 139 high school students, 16 to 18 years of age, sample size was decided by power calculation, and systematic randomized sampling was used. (scirp.org)
«Instead of effect sizes of 100 % for progranulin levels, we ask you to provide effect sizes of 20 - 30 % change for power calculations in progranulin brain levels for Figure 3 to determine whether the power value is 0.70. (eneuro.org)