She concurred with Hungerford's observation that intervention effects seem to wear off after a period of time.

No significant intervention effects were found for the other scales.

These methodological problems can mask valid intervention effects.

Single-subject designs are preferred because they are highly flexible and highlight individual differences in response to intervention effects.

Expand the time course for studying intervention effects to examine longer-term alterations in outcome/disorder trajectory.

Partially because of a high drop-out rate, a significant intervention effect was not detected, though differences were in the expected direction.

Our power analysis reveals that we might have missed a positive result if all non-responders had answered in a way to favor an intervention effect.

Then follow-up interviews would have to do less alcohol intake assessment, and that would mean less intervention effect on the control group.

Attention should be paid to the timeframe of the intervention effect considered in the evaluation.