What we have learned from several decades of research, and hundreds of failed Alzheimer's disease trials, is that no matter how promising the basic and early-phase data, all that really matters is the results of these late-phase effectiveness trials".
Phase 2: Effectiveness, cost-effectiveness and cost-utility study with a community-based randomized clinical trial.
This design was applied in particular to study community level public health interventions that have been proven effective in individual level trials, in so-called phase IV effectiveness trials [ 6, 9, 12– 14], and seems useful for the evaluation of complex healthcare interventions [ 6, 7, 9, 12, 14– 17].
As the number of transmissions is proportional to the number of hops traversed on the forwarding path in the data communication phase, the effectiveness of an underlying path selection scheme is determined by the number of transmissions since a path consisting of fewer hops will induce fewer onward transmissions.
Pre-clinical and clinical studies lead into phase four effectiveness studies and operational research.
In the third phase, the effectiveness of the developed implementation strategy will be evaluated in a randomised trial.
In this phase, the effectiveness of the shared care strategy implemented will be evaluated, recognising its limitations and identifying factors that determine its applicability in different contexts.
In conclusion, this study will provide quantitative and qualitative evidence to determine whether a phase 3 effectiveness trial of the Dil Mil intervention is merited.
Clinical trials usually consist of three phases; the first study tests safety and looks for the proper dose; if the drug is safe, it moves to the second phase to test effectiveness in a limited number of patients.
