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A power calculation was performed a priori, to establish the sample size, using the WINPEPI software programme PAIRSetc [ 26, 27].
The calculations to establish the sample size were done using the software G*Power 3.1.9.2 with one-way ANOVA test in three groups.
A multistage sampling technique was used to establish the sample size; data were collected from 350 military and civilian cantonment residents using a pretested questionnaire.
No definitive calculation exists to establish the sample size for a DCE 35 36; the survey ran until approximately 600 participants had completed it.
To establish the sample size for the study, a 10% difference in scores for the outcome measure assessed by questionnaires between the two arms of the study was considered clinically meaningful and assuming a standard deviation of 10 [ 36].
Similar(55)
The second calculation established the sample size required to detect a significant difference in outcome between patients treated by surgeons who had received PROMs feedback and those who were under the care of surgeons in the control arm.
The total number of ions of a peptide in the orbital trap in a scan establishes the sample size, n, where n = ∑ i = 0 q I i, and the fraction of each m/ z element (i) relative to all m/ z isotopologues is given by p i.
Thus, it was established that the sample size in each group should be at least 16.
This is a clinical decision, not a statistical one, and the values need to be established before the sample size calculation is done.
Sample size calculations aim to establish the minimum sample size that a study requires in order to be in a strong position to answer the primary research question.
Our first study is randomised and controlled, which is the strongest design to establish efficacy, and the sample size is large.
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