Thus, the study may be underpowered to detect significant differences in mortality, bleeding outcomes or transfusion.
Additionally, as migraine is more frequent in women than in men, studies performed in men may be underpowered to detect any significant association.
Most statistical methods for detecting selective sweeps from genetic polymorphism data, however, have focused on identifying hard selective sweeps in which a favored allele appears on a single haplotypic background; these methods might be underpowered to detect soft sweeps.
We did not find that ED crowding conditions resulted in an increase in return visits to the ED within 14 days for patients presenting with chest pain or shortness of breath and assigned a CTAS score of 2. Given that we experienced overall rates of return that were lower than anticipated, our study may be underpowered to detect a true difference.
As such, we may be underpowered to detect significant differences between groups recruited with RDS and targeted street outreach.
Genome-wide association studies published to-date have had mostly modest sample sizes, and even the ongoing efforts sponsored by Wellcome Trust and the GAIN initiative [8], [9] may still be underpowered to detect odds ratios in the range of 1.0 1.3, especially if the genetic variants of interest are not very common.
Due to the relatively low incidence rate of clinical malaria in this study population, estimates of the intervention effect are less precise than would be ideal for this type of analysis, and the time-stratified analyses are likely to be underpowered to detect effects in specific time strata.
Most studies would be underpowered to detect this effect size.
So this study may be underpowered to detect any differences.
Many of the studies were small and were likely to be underpowered to detect a difference.
Meta-analysis of a small number of studies may be underpowered to detect heterogeneity.
