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Of the remaining 11 subscales that did not demonstrate statistically significant change (likely since a conservative Bonferonni correction was used to control for Type I error), the improvement on six subscales nevertheless fell in the range of a medium effect size.
There was evidence of a medium effect (SMD 0.62 (0.58 to 0.67)) on zinc concentration.
In both cases, these changes were indicative of a medium effect size.
For differences of a medium effect size (f = 0.25) the power was 0.54 – 0.65 (total sample) or less.
Statistical power calculations showed that the sample size allowed the detection of a difference of a medium effect size (d ≥ 0.50) at the 0.01-level with power > 0.8.
According to Cohen's conventions only one value corresponds to a correlation size of a medium effect (r = 0.3-0.5 0.3-0.5ther correspond to allarge effect (> 0.5).
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Calculations are based on a medium effect size of 0.50, a two-sided significance level of 0.05 and a power of 0.90 (using G*Power 3.1.5 software) [ 28].
Measured at two weeks after the intervention, hypertension education showed a large effect size on knowledge of d+ 0.98, but declined to a medium effect size of d+ 0.46 when measured at four weeks [ 47].
The researchers aimed for a medium effect size of 0.5 in accordance with Cohen [ 28].
The difference of −6.77 between conditions corresponded to a medium effect size (0.50).
From the three cohorts providing both SSD and AP outcome data, the birth cohort provided consistent evidence (medium and large effects) of low IQ as an antecedent of SSD [ 29, 135], and mixed evidence of low IQ as an antecedent of AP (a medium effect noted for mania assessed at age 26 years [ 29], but no effect at age 32 years [ 135]).
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CEO of Professional Science Editing for Scientists @ prosciediting.com