DESIGNING MORE EFFECTIVE BEHAVIORAL INTERVENTIONS: …

DESIGNING MORE EFFECTIVE BEHAVIORAL

INTERVENTIONS: USING THE ORBIT MODEL FOR

BEHAVIORAL INTERVENTION DEVELOPMENT

Susan M. Czajkowski, Ph.D.

Chief, Health Behaviors Research Branch

Behavioral Research Program

Division of Cancer Control & Population Sciences

National Cancer Institute

International Behavioural Trials Network Meeting

May 20, 2016

Montreal, Quebec, Canada

Changing unhealthy behaviors is the ¡°single greatest

opportunity to reduce premature deaths¡­¡±

Schroeder SA. N Engl J Med 2007;357:1221-1228

Estimates are that 50% of new cancer cases could be

eliminated through engagement in healthy behaviors

? Smoking cessation

? Weight management

? Physical activity

? Regular screenings

? Healthy diets

Improving health-related behaviors can have

powerful effects on health ¡­

A 7% weight reduction and 2.5 hour per week activity increase led to a

58% reduction in the cumulative incidence of Type 2 diabetes in older

insulin-resistant individuals (Diabetes Prevention Program Research

Group, 2002).

But even when behavior change is successful, maintenance

of healthy behaviors across time is challenging

Change from baseline weight, Kg

Trials of Hypertension Prevention II:

Weight loss over 36 months in 2382 overweight pre-hypertensives

3

2

1

0

-1

-2

-3

-4

-5

0 mo

6 mo

12 mo

18 mo

Control

Stevens et al. Ann Intern Med, 2001

24 mo

Intervention

30 mo

36 mo

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