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We aim to evaluate key trial parameters, such as recruitment and retention of participants, randomisation, levels of missing data and preliminary indications of effectiveness, to inform calculation of a sample size for powering a full trial.
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There are limited data to provide estimates for a sample size calculation and this study will inform calculations for the future.
The study also sought any evidence of a change in GPs knowledge or behaviour that could inform calculations for a fully powered randomised controlled trial.
Such analyses can be used to inform calculations of the cost-effectiveness of different intervention options, for example the relative impact of more intense interventions reaching fewer high-risk individuals compared with less intense interventions reaching more people [ 19].
There was a paucity of data on the likely response rates to inform calculations of how many patients would need to be sent questionnaires to yield an achieved sample size of 274.
To detect CBT-related changes in brain function, a previous fMRI study of adult MDD [ 9] and a pilot study examining components of variance in a facial emotion perception task [ 44] are used to inform calculations of statistical power.
In this exploratory study, formal sample size calculations were not appropriate as previous studies to inform the calculation were not available.
27 We used this to inform the calculation of the number needed to treat to harm (all events considered here are undesirable).
We now turn to the issue of fitting trend lines to the data before and after referral, the basis for which will inform the calculation of any savings from ICCS intervention.
The underlying rate of breast feeding from the before-and-after cohort data and the risk ratios from the pilot RCT will inform the calculation of the sample size required for a definitive trial.
Power calculations were informed by calculation of effect size data from Lang et al 7 providing a between-group effect corresponding to Hedges' g of 0.66.
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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