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We also discover a difference in input performance with the mini-qwerty keyboard between stationary and mobile states.
With a five point fixed scale a large number of patients would be needed to discover a difference.
We put the significance level (alpha) to 5% with the probability of at least 80% to discover a difference between the two intervention groups.
Power analysis showed that a 90% power to discover a difference of 10 points (SD 12) in DASH score would require 62 patients.
Power calculation ensures that, if the hypotheses are true, we will be able to discover a difference of at least 15% between the intervention groups and a difference of at least 20% between the intervention groups and the control group.
For the mean values of TNF-α and IL-6, we assumed to discover a difference of 30%% between the FBV and placebo groups after 8 weeks of treatment (and in comparison from pre- to post-exercise) and a standard deviation of 30%%.
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They discovered a difference in the number of white blood cells called neutrophils produced by the body to heal the damage in the bowel and on the surface of the skin.
If one discovered a difference in, for example, the genealogies of Jesus as they appear in Matthew's and Luke's Gospels, he argued that these were hermeneutic trip wires deliberately inserted by the holy spirit to make the reader think that bit harder about the New Testament's other meanings – symbolic, ethical and allegorical – rather than the merely literal.
Now, researchers have discovered a difference in brain scans between the two groups of patients that appears early in the course of the pain.
A few months ago, when Rachel Metz of MIT Technology Review compared three fitness bands from leading companies simultaneously, she discovered a difference of more than 40% between the highest and lowest score.
The size of the groups gives an 80% chance of discovering a difference between the groups of seven points.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com