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Randomized trial of 527 corporate employees was conducted to evaluate an exercise intervention based on the transtheoretical model and tailored to individual stages of change. No significant difference in physical activity by stage was evident at baseline among three treatment groups. At follow-up, the group receiving a staged-based message increased activity by 13% and a significant difference was evident in the magnitude and direction of movement across stages, suggesting that tailored messages to stages of change may be an effective strategy for physical activity interventions.
Peterson et al. (1999) studied this question.