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Impact of Participant and Interventionist Race Concordance on Weight Loss Outcomes

We have previously shown that racial composition of behavioral intervention groups does not affect achieved weight loss. However, it is unclear if the race of the interventionist affects intervention outcomes. The objective of this analysis is to estimate the impact of race concordance between parti... Full description

Journal Title: Obesity 07/02/2012
Main Author: Batch, Bryan C.
Other Authors: Ard, Jamy D. , Vollmer, William M. , Funk, Kristine , Appel, Lawrence J. , Stevens, Victor J. , Samuel-Hodge, Carmen , Loria, Catherine M. , Hollis, Jack F. , Svetkey, Laura P.
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ID: ISSN: 1930-7381 ; E-ISSN: 1930-739X ; DOI: http://dx.doi.org/10.1038/oby.2012.184
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title: Impact of Participant and Interventionist Race Concordance on Weight Loss Outcomes
format: Article
creator:
  • Batch, Bryan C.
  • Ard, Jamy D.
  • Vollmer, William M.
  • Funk, Kristine
  • Appel, Lawrence J.
  • Stevens, Victor J.
  • Samuel-Hodge, Carmen
  • Loria, Catherine M.
  • Hollis, Jack F.
  • Svetkey, Laura P.
subjects:
  • Article
ispartof: Obesity, 07/02/2012
description: We have previously shown that racial composition of behavioral intervention groups does not affect achieved weight loss. However, it is unclear if the race of the interventionist affects intervention outcomes. The objective of this analysis is to estimate the impact of race concordance between participant and interventionist on weight change in the initial weight loss phase (phase 1) of the Weight Loss Maintenance trial (WLM). A total of 1,685 overweight or obese adults (body mass index [BMI] 25–45 kg/m 2 ) who were taking medication for hypertension and/or dyslipidemia participated in Phase I of the WLM trial. All participants received a 6-month intensive behavioral intervention in groups of 15–20 facilitated by a trained interventionist. The main outcome is change in weight at 6 months. Participants were on average 55 years of age, 67% female and 44% AA. Three of seventeen interventionists were AA, 14 were non-AA. Seventy-three percent of participants shared race concordance with the interventionist. There was a small but statistically significant difference in weight change of participants who were the same race as the interventionist (−5.84 kg, SE 0.17) compared to those who were not race concordant (−5.04 kg, SE 0.33), a difference of 0.8kg, (p= 0.04). The impact of concordance on weight change differed by race (i.e., interaction of race and concordance was significant, p= 0.02). In a post-hoc analysis of a group-based behavioral intervention, race concordance for Non-AA participants was associated with slightly greater weight loss. Race concordance was not associated with weight loss for AA participants.
language:
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identifier: ISSN: 1930-7381 ; E-ISSN: 1930-739X ; DOI: http://dx.doi.org/10.1038/oby.2012.184
fulltext: fulltext
issn:
  • 19307381
  • 1930-7381
  • 1930739X
  • 1930-739X
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titleImpact of Participant and Interventionist Race Concordance on Weight Loss Outcomes
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descriptionWe have previously shown that racial composition of behavioral intervention groups does not affect achieved weight loss. However, it is unclear if the race of the interventionist affects intervention outcomes. The objective of this analysis is to estimate the impact of race concordance between participant and interventionist on weight change in the initial weight loss phase (phase 1) of the Weight Loss Maintenance trial (WLM). A total of 1,685 overweight or obese adults (body mass index [BMI] 25–45 kg/m 2 ) who were taking medication for hypertension and/or dyslipidemia participated in Phase I of the WLM trial. All participants received a 6-month intensive behavioral intervention in groups of 15–20 facilitated by a trained interventionist. The main outcome is change in weight at 6 months. Participants were on average 55 years of age, 67% female and 44% AA. Three of seventeen interventionists were AA, 14 were non-AA. Seventy-three percent of participants shared race concordance with the interventionist. There was a small but statistically significant difference in weight change of participants who were the same race as the interventionist (−5.84 kg, SE 0.17) compared to those who were not race concordant (−5.04 kg, SE 0.33), a difference of 0.8kg, (p= 0.04). The impact of concordance on weight change differed by race (i.e., interaction of race and concordance was significant, p= 0.02). In a post-hoc analysis of a group-based behavioral intervention, race concordance for Non-AA participants was associated with slightly greater weight loss. Race concordance was not associated with weight loss for AA participants.
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issue4
volume21
pages712-717
date2012-07-02