Still, the 181 included are sufficient enough according to the more detailed interim power calculation, and should be enough even the inevitable attrition in the follow ups.
East and SAS statistical software will be used for the sample size calculations, interim analyses and final analyses.
Details of the PREDIMED trial including sample size calculations and interim analysis have been fully described elsewhere [ 36- 38].
Details of the PREDIMED trial including sample size calculations and interim analysis have been fully described elsewhere [ 38, 39].
This assumption allows the calculation of interim utility values and was made based on consultation with the clinical experts.
As such, a pilot phase might be built into this study in order to inform a sample size calculation (see 'Interim analysis' section later).
The Dutch national calculation scheme for railway noise has been declared the default interim method for railway noise calculation by the EU, until the introduction of results from the Harmonoise project.
Cao ([2004]) proposed an iterative technique, in which the calculation of the interim values of stand level predictor variables was based on stand-level models.
In the interim, existing global estimates, and regional calculations based on disability adjusted life years and gender disaggregated information, are available to inform policy discourse.
Reporting of additional information such as adjustment for multiple testing (for example, multiple endpoints, multiple checks during interim monitoring) required for the sample size calculation was also documented.
