Given the evidence that one stage-based intervention is as effective as six (Velicer et al., 1999), the fairly low rates of second and third intervention delivery in the trial are probably not the cause of this lack of effect.
Given the evidence that one stage-based intervention is as effective as six (Velicer et al., 1999), the fairly low rates of second and third intervention delivery in the trial are probably not the cause of this lack of effect.