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a. Motivational Interviewing intervention had a statistically significant effect on the amount of alcohol consumed in gram (Y-axis) during a typical weekend (Friday night-Sunday night) in Marsden et al. (2006), according to Foxcroft et al.'s data (SMD = −0.35; SE = 0.11 at 6-month follow-up). Error bars indicate standard deviations.
b. In truth, no evidence of any change or intervention effect existed in Marsden et al. (2006). Error bars indicate standard deviations.
