Martin et al. (1996) propose that stage movement is a better
outcome to assess the effectiveness of smoking cessation interventions
because, among other reasons, it is more common than
stopping smoking and trials would have more power to detect an
effect. In this study, there were very small and not statistically
significant advantages for the TTM arm in the quitting outcomes
(Aveyard et al., 2003), and it was plausible that the benefit was
obscured because quitting was rare and the analysis lacked power.
These data show no advantage for the TTM-based intervention in
stage movement, implying that the negative results on stopping
smoking were not due to lack of power. Thus, the TTM-based stage matched
intervention was not more effective than the non stage-
based control intervention. 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.
Martin et al. (1996) propose that stage movement is a better
outcome to assess the effectiveness of smoking cessation interventions
because, among other reasons, it is more common than
stopping smoking and trials would have more power to detect an
effect. In this study, there were very small and not statistically
significant advantages for the TTM arm in the quitting outcomes
(Aveyard et al., 2003), and it was plausible that the benefit was
obscured because quitting was rare and the analysis lacked power.
These data show no advantage for the TTM-based intervention in
stage movement, implying that the negative results on stopping
smoking were not due to lack of power. Thus, the TTM-based stage matched
intervention was not more effective than the non stage-
based control intervention. 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.
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