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Slight differences in mean effects between two-phase models of TVET and other models were observed, with two-phases usually, but not always, producing the larger effects.
This involves calculating costs as well as the cost-effectiveness ratio, i.e. the ratio of the difference in mean costs and the difference in mean effects between the intervention and control group.
Incremental cost-effectiveness ratios (ICERs) will be calculated by dividing the difference in mean total costs between the treatment and control groups by the difference in mean effects between the groups.
Incremental cost effectiveness ratios (ICERs) are calculated by dividing the differences in mean total costs between both treatment groups, by the difference in mean effects between both treatment groups.
Incremental cost-effectiveness ratios (ICERs) will be calculated by dividing the difference in mean total costs between the treatment groups by the difference in mean effects between the treatment groups.
Incremental cost-effectiveness ratios (ICERs) will be calculated by dividing the difference in mean total costs between the intervention group and the CAU group by the difference in mean effects between the groups.
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The ICER was defined as the incremental difference between the mean cost of treatment regimens, divided by the incremental difference in mean effect between treatment regimens.
We used two approaches to the analysis of the data: an adjusted t-test to assess evidence of a difference in mean effect between the full intervention and control (partial intervention) hospitals-a simple but robust approach [ 25]-and a hierarchical logistic regression model for these repeated survey data.
For vitamin D studies, mean effects were between 1.00 (exclusion of Smith study) and 1.18 (exclusion of Lyons study).
The EVSI indicates that a larger trial is necessary to obtain more precise estimates of differences in mean effects and costs between treatment groups.
A lack of randomnisation may have resulted in regression to the mean effects, natural variation between pre-test and post-test may then be interpreted as a real change.
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