In a clinical setting, the accuracy of the performance error might not be sufficient to detect a difference between the predicted fentanyl concentration and measured fentanyl concentration.
According to the power calculation, inclusion of 26 participants would be sufficient to detect a statistically significant difference of 20% (SD 30%) in biomarker level between interventions at a significance level of 5% with a power of 90%.
Based on the preliminary data and a test power analysis of 0.85, the sample size calculation showed that at least three specimens are sufficient to detect a 10% difference with a significance level of 5%.
Even though our pooled sample size was smaller than the ANVISA recommendation of 200 g for fecal-coliform analysis, the samples with 25 g were sufficient to detect a high level of contamination.
Power analysis revealed that a sample size of 116 patients would be sufficient to detect a 4-fold difference in pelvic infection rates between the 2 groups, with 90% power and a probability value of.05.
This number was also sufficient to detect a reduction in hookworm prevalence of 30%.
The sample size was sufficient to detect a difference between birth order groups of 0.15 z-scores.
RNA from 12 brain tumor samples with some variation in their histological diagnoses was sufficient to detect a set of miRNA-mRNA pairs whose fluctuations are highly correlated.
Thus, view-dependent representations, which consist of low-level sensory features from the visual image [10], were sufficient to detect a geon change in the 'no rotation' condition, but were not sufficient to detect a geon change in the 'rotation' condition.
Due to concerns that these numbers might be small and would not be sufficient to detect a difference in safety between the two groups, the primary endpoint was changed to the proportion of subjects with any related adverse event.
Yet, as the sample for the CBT treatment group was sufficient to detect a predictive potential of functional MRI [7], it is possible that if structural effects exist, they might be more subtle than functional ones.
