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Obesity Modifies the Association of Race/Ethnicity with Medication Adherence in the CARDIA Study
Maribel Salas1, Catarina I Kiefe, Pamela J Schreiner
11 Division of Preventive Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA 2 Division of Epidemiology & Community Health, University of Minnesota, Minneapolis, Minnesota, USA.
Insights
Medication adherence varies by race and weight. Whites with normal weight adhered more than African Americans, but this difference disappeared in heavier individuals. This highlights disparities in managing chronic diseases.
Area of Science:
- Public Health
- Health Disparities
- Clinical Research
Background:
- Medication adherence is crucial for managing chronic conditions.
- Understanding how race/ethnicity and weight influence adherence is vital for effective treatment.
- The CARDIA (Coronary Artery Risk Development in Young Adults) study provides a valuable dataset for examining these associations.
Purpose of the Study:
- To investigate the relationship between race/ethnicity and medication adherence.
- To determine if weight category (normal, overweight, obese) modifies this association.
- To identify potential disparities in medication adherence among diverse populations.
Main Methods:
- Analysis of 1355 participants from the CARDIA study taking prescription medications.
- Assessment of medication adherence using the four-item Morisky medication adherence scale.
- Stratification of analyses by weight category and race/ethnicity.
Main Results:
- Overall, White participants showed higher maximum medication adherence than African American participants (59% vs. 41%).
- This adherence difference was significant only in the normal weight category (54% of Whites vs. 35% of African Americans).
- After adjustments, normal weight White individuals had nearly double the odds of maximum adherence compared to normal weight African Americans (OR=1.98).
Conclusions:
- Weight status significantly modifies the association between race/ethnicity and medication adherence.
- High non-adherence rates in African Americans and overweight/obese Whites pose challenges for managing obesity-related diseases.
- Targeted interventions considering both race and weight are needed to improve medication adherence and health outcomes.
Objective:
To assess associations between race/ethnicity and medication adherence, and the potential modifying effects of weight category (normal, overweight, obese) in a community-based sample.
Study Design And Setting:
We studied 1355 participants from the CARDIA (Coronary Artery Risk Development in Young Adults) study who were taking prescription medications in 2000-1. Medication adherence, as rated on the four-item Morisky medication adherence scale (score of 4 = maximum adherence), was reported for all participants.
Results:
The mean age ± SD of participants was 40 ± 3.6 years; 45% were African American and 36% were male. Overall, Whites had a higher proportion of maximum adherence than African Americans (59 vs 41%, respectively; p = 0.001). However, this difference was statistically significant only for participants within the normal weight category, of whom 54% of Whites were maximally adherent versus 35% of African Americans (p < 0.05). After adjustment for possible confounding covariates, race/ethnicity was associated with adherence only in those of normal weight: the odds ratio for maximum adherence in Whites versus African Americans of normal weight was 1.98 (95% CI 1.13, 3.47). Within race/ethnicity subgroups, weight category was associated with adherence in Whites but not in African Americans.
Conclusion:
Weight category modifies the association of race/ethnicity with medication adherence. The high levels of non-adherence observed among African Americans and obese and overweight Whites bodes poorly for treatment of obesity-associated diseases such as cardiovascular disease or diabetes mellitus.
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