Design and participant characteristics for a randomized effectiveness trial of an intensive lifestyle intervention to reduce cardiovascular risk in adults with type 2 diabetes: The I-D-HEALTH study.

Intervening in Diabetes with Healthy Eating, Activity and Linkages To Healthcare (I-D-HEALTH) is a community-based randomized trial evaluating the effectiveness of a group-based adaption of the Look AHEAD intensive lifestyle intervention. Most potentially eligible patients were identified through electronic medical record queries or referral to a diabetes resource hub. Trial enrollees had a usual source of primary care, elevated body mass index (BMI) and type 2 diabetes. I-D-HEALTH participants were randomized to either standard care alone or standard care plus free-of-charge access to a group-based lifestyle intervention (GLI) offered by the YMCA. GLI participation was encouraged, but not required, for the latter group. The primary outcome is percent weight change over 6, 12 and 24months. Secondary outcomes include direct intervention costs and direct medical and non-medical expenditures, as well as changes in systolic blood pressure, hemoglobin A1c and cholesterol. Among 331 I-D-HEALTH participants, 167 were randomized to standard care and 164 to GLI. The mean age (±standard deviation) in each group was 57.1years (±12.2) and 57.6years (±10.5), respectively. Mean BMI was 34.9kg/m(2) (±7.3) among standard care participants and 36.2kg/m(2) (±7.8) among GLI participants. In both groups, approximately one third of participants were non-Hispanic Whites. We detected no significant differences between groups in mean systolic blood pressure, hemoglobin A1c or total cholesterol (P >0.05 for all characteristics above). The I-D-HEALTH study enrolled a diverse sample of adults with diabetes and offers a unique opportunity to evaluate the effectiveness of offering a community-based intensive lifestyle intervention.

The impact of expectations and satisfaction on the initiation and maintenance of smoking cessation: an experimental test.

OBJECTIVE: Our primary objective was to test the thesis that the initiation of behavior change is dependent on favorable expectations, whereas maintaining a change in behavior is dependent on satisfaction with the outcomes afforded by behavior change. These hypotheses were tested in the context of a smoking cessation intervention. DESIGN: Adult smokers were randomized to an 8-week smoking cessation program designed to induce either optimistic or modest expectations about cessation. Participants were encouraged to quit smoking after Week 4 and were followed for 15 months after the end of the program. MAIN PROCESS AND OUTCOME MEASURES: The authors focused on participants' expectations about cessation, satisfaction with cessation, and smoking status. RESULTS: The effect of the expectation manipulation on smokers' beliefs about cessation was moderated by their prior cessation success. Those led to hold favorable expectations about cessation were more likely to initiate cessation. Although satisfaction was not affected by initial expectations, it predicted maintained cessation. CONCLUSIONS: Results highlight the challenge of altering how smokers think about cessation and the need for further research on intervention strategies that target different factors for the initiation and maintenance of cessation.

Relation of body mass index to depression and weighing frequency in overweight women.

OBJECTIVE: Research suggests that overweight and obesity are associated with depressive symptoms, particularly among women. Evidence from weight control trials suggests that higher weighing frequency is associated with greater weight loss or less weight gain. As limited data exist on the effects of self-weighing on body mass index (BMI) among overweight adults with or without depression, this study seeks to examine this issue using data from a population-based epidemiologic survey. METHODS: Data from a large population-based survey of 4655 women ages 40-65 in the greater Seattle area, surveyed from November 2003 to February 2005, were used to examine associations of depression and weight self-monitoring with BMI. Sample-weighted regression models were used to examine associations of depression, self-weighing frequency, and BMI, with demographic factors (race/ethnicity, employment status, smoking status, age, martial status, educational attainment) entered as covariates. RESULTS: Regression models indicated that higher self-weighing frequency and negative depression status were independently associated with lower BMI, with no interaction observed between depression and self-weighing. CONCLUSION: Frequent self-weighing appears to be associated with lower BMI in both depressed and non-depressed overweight women.

Specifying the determinants of the initiation and maintenance of behavior change: an examination of self-efficacy, satisfaction, and smoking cessation.

Using data from smokers (N = 591) who enrolled in an 8-week smoking cessation program and were then followed for 15 months, the authors tested the thesis that self-efficacy guides the decision to initiate smoking cessation but that satisfaction with the outcomes afforded by quitting guides the decision to maintain cessation. Measures of self-efficacy and satisfaction assessed at the end of the program, 2 months, and 9 months were used to predict quit status at 2, 9, and 15 months, respectively. At each point, participants were categorized as either initiators or maintainers on the basis of their pattern of cessation behavior. Across time, self-efficacy predicted future quit status for initiators, whereas satisfaction generally predicted future quit status for maintainers. Implications for models of behavior change and behavioral interventions are discussed.