Because one of our central findings is a lack of an effect (between reminisced and forgotten items), we conducted all of the reported analyses again using pooled data from both experiments, and we assessed power for each of the relevant comparisons.
To date, very few studies have assessed power and sample size requirements in microarray experiments.
Second, we assessed power and type I error of KWII and RPM given varying allele frequencies, heritability and penetrance using GGI models with parameters identical to those of Richie et al. (Table 3) [ 2, 16].
Of the 19 studies which assessed power grip strength, only six studies [ 17, 19, 20, 24, 26, 29] reported actual pre-operative, early and late post-operative values which have been plotted on a line graph (Fig 1).
We assessed power of the KWII at a sample size of 2400 12000 cases and 1200 controls) for Model 1-GH, Model 2-GH, Model 3, Model 3-GH, Model 4 and Model 4-GH.
The reviewers assessed power calculations as being 'done' where there was evidence of a power calculation being conducted, 'not clear' if it was not reported and 'not done' if the authors specifically report that the study was under-powered.
