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Author: Ostbye, Truls
Resulting in 3 citations.
1. Finkelstein, Eric A.
Ostbye, Truls
Malhotra, Rahul
Body Mass Trajectories through Mid-Life among Adults with Class I Obesity
Surgery for Obesity and Related Diseases 9,4 (July-August 2013): 547-553.
Also: http://www.sciencedirect.com/science/article/pii/S1550728912000123
Cohort(s): NLSY79
Publisher: Elsevier
Keyword(s): Body Mass Index (BMI); Health/Health Status/SF-12 Scale; Life Course; Obesity; Weight

Background: Little is known about body mass trajectories for adults with Class I obesity.

Objectives: To map body mass trajectories through mid-life for young adults with Class I obesity.

Setting: United States.

Methods: Data from the National Longitudinal Study of Youth 1979 was utilized to generate a cohort of 1058 males and females, aged 25-33 years with Class I obesity in 1990. Group-based trajectory modeling was used to identify the number and shape of body mass index (BMI) trajectories from 1990 to 2008 for this cohort.

Results: By 2008, around 15% of males and females with Class I obesity in 1990 experienced a BMI increase beyond 40 kg/m2. The trajectory analyses showed that roughly 1/3rd of the sample were on one of two BMI trajectory groups that culminated with average BMI values well above 35 kg/m2.

Conclusions: The large majority of young adults with Class I obesity are likely to gain weight over time. For many, the weight gain will be significant and greatly increase their risk of obesity related comorbidities and reduced life expectancy. As a result, bariatric surgery or other intensive weight management options may be warranted.

Bibliography Citation
Finkelstein, Eric A., Truls Ostbye and Rahul Malhotra. "Body Mass Trajectories through Mid-Life among Adults with Class I Obesity." Surgery for Obesity and Related Diseases 9,4 (July-August 2013): 547-553.
2. Malhotra, Rahul
Ostbye, Truls
Riley, Crystal M.
Finkelstein, Eric A.
Young Adult Weight Trajectories Through Midlife by Body Mass Category
Obesity 21,9 (September 2013): 1923-1934.
Also: http://onlinelibrary.wiley.com/doi/10.1002/oby.20318/abstract
Cohort(s): NLSY79
Publisher: Wiley Online
Keyword(s): Body Mass Index (BMI); Health/Health Status/SF-12 Scale; Life Course; Obesity; Weight

Permission to reprint the abstract has not been received from the publisher.

Objective: To estimate the expected weight gain through midlife for those in a given BMI category in young adulthood.

Design and Methods: Group-based trajectory modeling and National Longitudinal Survey of Youth 1979 data from 1990 to 2008 were used to quantify weight trajectories through midlife for 10,038 young adult men and women stratified by BMI category. Logistic regression was used to assess the association of trajectory membership with obesity-related conditions (hypertension, diabetes, arthritis) in middle age.

Results: Annual weight gain averaged 0.53 kg (1.17 lb) across the entire sample. However, there was considerable variation by and within BMI categories. More than 98% of men and 92% of women were on upward-sloping trajectories, generally moving into a higher BMI category by middle age. Those who experienced early and rapid weight gain during young adulthood were most likely to be on a steeper trajectory and had greater risks for obesity-related conditions.

Conclusion: This study points to the health and weight benefits of entering young adulthood with a normal BMI, but further reveals that this is no guarantee of maintaining a healthy weight through midlife. For those who are young adults today, weight maintenance is unlikely to occur without significant environmental or technical innovation.

Bibliography Citation
Malhotra, Rahul, Truls Ostbye, Crystal M. Riley and Eric A. Finkelstein. "Young Adult Weight Trajectories Through Midlife by Body Mass Category." Obesity 21,9 (September 2013): 1923-1934.
3. Ostbye, Truls
Malhotra, Rahul
Landerman, Lawrence R.
Body Mass Trajectories Through Adulthood: Results from the National Longitudinal Survey of Youth 1979 Cohort (1981-2006)
International Journal of Epidemiology 40,1 (February 2011): 240-250
Cohort(s): NLSY79
Publisher: Oxford University Press
Keyword(s): Age and Ageing; Body Mass Index (BMI); Educational Attainment; Ethnic Differences; Gender Differences; Modeling, Growth Curve/Latent Trajectory Analysis; Obesity; Racial Differences; Urbanization/Urban Living

Permission to reprint the abstract has not been received from the publisher.

Background
Most studies describing change in body mass through adulthood model an 'average' trajectory bearing the same functional form in the underlying population. Latent-class growth modelling has revealed the presence of several underlying body mass/obesity trajectory groups among children and adolescents, but has not been applied to capture adult body mass trajectories. We apply the technique to identify adult body mass trajectory groups, risk factors for group membership and (time-varying) modifiers of trajectory level within each group, and assess association between group membership and important health outcomes in midlife.
Methods
Body mass trajectory groups, from age 18 to 49 years, were identified using latent-class growth modelling based on the National Longitudinal Survey of Youth 1979 (n=9681). Role of gender, race/ethnicity and age cohort as risk factors for group membership, and of highest grade of education completed, years of urban living, years in employment, years in poverty and years married as modifiers of trajectory level was evaluated.
Results
Four trajectory groups, 'normal weight', 'overweight', 'late adulthood obesity' and 'early adulthood obesity' were identified. Males, Blacks and those born later had higher odds of being in the three latter groups. More education and years married lowered the trajectory within each group. The prevalence of most health outcomes was lowest in the 'normal weight' group, somewhat greater in the 'overweight' group, greater again in the 'late adult obesity group' and highest in the 'early adulthood obesity' group.
Conclusion
Regular body mass index screening and monitoring in early adult life may identify a person as belonging to one of these four groups early, and allow the individual and health-care providers opportunities to initiate behavioural or other interventions better tailored to the specific group
Bibliography Citation
Ostbye, Truls, Rahul Malhotra and Lawrence R. Landerman. "Body Mass Trajectories Through Adulthood: Results from the National Longitudinal Survey of Youth 1979 Cohort (1981-2006)." International Journal of Epidemiology 40,1 (February 2011): 240-250.