Comparison of Weight Management Programs Delivered in Large Versus Small Groups

Comparison of Weight Management Programs Delivered in Large Versus Small Groups

The purpose of this study is to compare the 6- and 12-month weight changes associated with lifestyle interventions delivered in a large group or small groups of participants. It is hypothesized that participants receiving treatment in a small group will have greater weight loss than those assigned to a larger group.

Inclusion Criteria:

• at least 21 years-old
• body mass index (BMI) between 30-45

Exclusion Criteria:

• have lost >4.5 kg in past six months
• have medical condition(s) likely to affect ability to participate in physical activity
• planning to relocate from the area in next 12 months
• unable or unwilling to attend weekly group sessions
• unwilling to accept random assignment