Your English writing platform
Discover LudwigSuggestions(2)
Exact(4)
2. Sample size calculation Estimates of the location of the mean and variability around the mean (standard deviation) for the primary outcome measure (see measures) will be calculated.
This will allow outcome measurement in 15-20 individuals in each study arm to estimate a mean and standard deviation for the primary outcome, physical activity counts/per week from a 7-day accelerometry assessment in each group.
The calculation of sample size was based on the results from an earlier study performed on older adults, in which the standard deviation for the primary outcome was 1.4 for COPM performance and 1.6 for COPM satisfaction [ 24].
In an earlier study performed on older adults, the standard deviation for the primary outcome has been shown to be 1.4 for COPM performance and 1.6 for COPM satisfaction [ 27].
Similar(54)
Table 2 summarizes the means and standard deviations for the primary outcomes explored in this study-FV intake, PA, and BMI.> -wrap-foot>> -wrap-foot> *ANOVA (F-test) or χ2 tests to determine if differences exist based rural or urban residency.
The observed standard deviation of the primary outcome for the first 43 recruited participants, adjusted as for primary analysis, was 1.1 points.
For stage 1 this included the first 13 per protocol (PP) patients (i.e., all patients assigned to study treatment with no major protocol deviation) for whom the primary efficacy variable was assessable, and for stage 2 this included the next 33 PP patients for whom the primary efficacy variable was assessable.
We assumed that the standard deviation of timber volume, S h, would be unknown for the purposes of survey design and used the standard deviation of the primary stratification variable instead.
The observed standard deviation of the primary outcome was 24 points compared with the 20 points we used for the power calculation.
Table 2 provides descriptive statistics (mean, standard deviation) for the three primary and two secondary outcome variables across the three measurement time points.
Assuming an alpha level of 0.00625, a 2-sided test, and a standard deviation of 1.0 for the primary outcome, LAZ, 192 evaluable women per arm at each site will allow detection of an effect size of 0.37 with 80% power.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com