Modifiable barriers to adherence to inhaled steroids among adults with asthma: it's not just black and white

J Allergy Clin Immunol. 2003 Jun;111(6):1219-26. doi: 10.1067/mai.2003.1479.

Abstract

Background: Sociobehavioral factors influence adherence to inhaled corticosteroid (ICS) in adults with asthma and warrant exploration as explanations of apparent racial disparities in adherence.

Objective: The purposes of this study were to identify barriers to adherence, potentially modifiable by healthcare providers, in a group of African Americans and non-African Americans and to test modifiable barriers as explanations of racial-ethnic differences in adherence.

Methods: We conducted a cohort study of 85 adults (mean age, 47 +/- 15 years; 61 [72%] female; 55 [65%] African American) with moderate or severe persistent asthma to determine modifiable sociobehavioral predictors of adherence. These were knowledge of the function of ICS, patient-perceived adequacy of communication with the provider, social support, attitude (perception of risks/benefits of ICS), depression, and self-efficacy. Adherence was calculated from electronic monitoring data as the mean of the number of doses recorded per 12 hours divided by the number prescribed, truncated at 100%. Past adherence, baseline severity of symptoms, and sociodemographics were treated as fixed confounders in ordinal logistic modeling.

Results: Adherence was 60% +/- 30%. In bivariate analyses, favorable attitude to ICS (P =.01) was associated with better adherence. Of immutable predictors, African American race-ethnicity (P =.001), lower educational achievement (P =.01), lower household income (P =.002), and more baseline symptoms (P =.003) were associated with poorer adherence. In multivariable analysis, controlling for immutable predictors, favorable attitude was associated with adherence. Favorable attitude was associated with greater adherence in African Americans and non-African Americans. Controlling for immutable factors, the race-adherence relationship was not mediated by the mutable factors, but economic factors (income and insurance) were mediators.

Conclusion: Attitude is strongly related to adherence but does not mediate the effect of race-ethnicity.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Administration, Inhalation
  • Adrenal Cortex Hormones / administration & dosage
  • Adrenal Cortex Hormones / therapeutic use*
  • Adult
  • African Americans* / psychology
  • Asthma / diagnosis
  • Asthma / drug therapy*
  • Asthma / ethnology*
  • Attitude to Health
  • Cohort Studies
  • European Continental Ancestry Group* / psychology
  • Female
  • Humans
  • Male
  • Middle Aged
  • Models, Theoretical
  • Patient Compliance / ethnology*
  • Social Class
  • United States

Substances

  • Adrenal Cortex Hormones