Fig. 3From: Effectiveness of motivational interviewing, health education and brief advice in a population of smokers who are not ready to quitRelative efficacy and effectiveness of BA, HE and MI, a The efficacy of HE was superior to BA and MI throughout the study. b The effectiveness of HE dropped drastically in weeks 3–12 and it remained below the effectiveness of BA from week 12 onward. A penalty of α = 0.20 was considered in the effectiveness formula (3)Back to article page