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Discover Pediatric Collections on COVID-19 and Racism and Its Effects on Pediatric Health

American Academy of Pediatrics
ELECTRONIC ARTICLE

Impact of Site of Care, Race, and Hispanic Ethnicity on Medication Use for Childhood Asthma

Alexander N. Ortega, Peter J. Gergen, A. David Paltiel, Howard Bauchner, Kathleen D. Belanger and Brian P. Leaderer
Pediatrics January 2002, 109 (1) e1; DOI: https://doi.org/10.1542/peds.109.1.e1
Alexander N. Ortega
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Peter J. Gergen
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A. David Paltiel
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Howard Bauchner
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Kathleen D. Belanger
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Brian P. Leaderer
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Abstract

Objective. To understand the importance of source of care and other factors that influence differences in asthma medication use by race and Hispanic ethnicity.

Methods. The Childhood Asthma Severity Study provided 12-month, retrospective, parent-reported questionnaire data on a monthly basis for children ages ≤12 years in a community sample of 1002 children and their families from Connecticut and Massachusetts. Medications considered included cromolyn, β2-agonist, inhaled steroids, anticholinergics, theophylline, and systemic steroids. Information was available on demographics, insurance status, symptom severity, primary care contact, and provider practice types.

Results. Black and Hispanic children received fewer β2-agonists, and Hispanic children received fewer inhaled steroids than white children after adjusting for patients’ race, age, gender, insurance status, symptom severity, number of primary care visits for asthma, number of urgent visits to the regular provider, family income, maternal education, and site of care. When multivariate analyses were restricted to patients in private practice, the significant association between Hispanic ethnicity and low inhaled steroid use persisted, whereas differences in β2-agonist use by race and ethnicity changed little but became nonsignificant.

Conclusion. Even within private practices, patients’ race and ethnicity are associated with clinician nonadherence to national guidelines. Programs to eliminate these disparities will need both to focus on site of care and to intervene at the provider and patient levels to be successful.

  • asthma
  • child
  • practice
  • guidelines
  • health insurance
  • Hispanic Americans

Asthma is a serious pediatric health concern in the United States. Asthma affects approximately 4.4 million children and accounts for approximately 2.9 million visits to pediatricians each year.1–3 Moreover, asthma imposes a disproportionate burden on ethnic and racial minorities and poor children.4,5 Current information suggests that factors other than environmental and household risks are major contributors to the high asthma diagnosis rates and poor asthma control observed among racial minorities.6–8 Factors that contribute to the differences in asthma rates and control between minority and nonminority children include diagnosing patterns, parental perceptions of asthma, quality of and access to health care, and, most notably, medication utilization.9–12 Addressing asthma medication utilization disparities is particularly important because it is known that asthma morbidity can be prevented and that emergency department visits and hospitalizations may be reduced by appropriate asthma treatment.13–15

The undertreatment of asthma among racial and ethnic minorities is well-documented.16 Among racial and ethnic minorities in the United States, asthma treatment has 2 consistent and enduring characteristics: 1) lack of access to treatment and 2) health care inconsistent with the guidelines of the National Asthma Education and Prevention Program of the National Heart, Lung, and Blood Institute.16–20 For example, studies have documented that minority children are more frequent users of reliever medications such as short-acting β-agonists and not control therapies such as inhaled antiinflammatory medications.17–20 In addition, data from the National Health and Nutrition Examination Survey III, a survey of the US population, reported that young, poor, and Spanish-speaking children were at high risk for inadequate asthma therapy.21 A cross-sectional study of inner-city children who were from Washington, DC, and Baltimore, Maryland, and had at least mild persistent asthma found that these children were high nebulizer users of β-agonists but low users of inhaled steroids.22

Asthma medication utilization disparities have been reported in situations in which racial and ethnic differences in access barriers should be minimized. Joseph et al23 reported that among children with asthma in a Michigan health maintenance organization (HMO), black children received fewer prescribed medications than white children when seeing nonspecialists. Finkelstein et al9 reported that minority children who had been hospitalized for asthma were less likely than their nonminority hospitalized peers to have received effective preventive asthma therapy; however, after adjusting for primary care practice types, race was no longer a significant factor. Children in their study who were seen by private practice physicians were more likely to receive appropriate care based on practice guidelines than those treated in public settings. The notion that practice type is associated with the delivery of care deemed appropriate by national guidelines has also been reported by Flores et al,24 who found that clinical practice guideline use was more common among pediatricians who practiced in HMOs than in other settings.

Data from the Childhood Asthma Severity Study (CHAS), a community-based study of childhood asthma among a racially and ethnically diverse population, offered the opportunity to evaluate racial and ethnic differences in asthma treatment patterns. CHAS provides sufficient information to allow the evaluation of the importance of site of care and other potential explanatory variables for the reported racial and ethnic differences in asthma treatment patterns. We sought to determine whether differences in medication use by site of care and race and ethnicity persist after adjusting for previous patterns of health care use, insurance status, and symptom severity. The goal of this study was to determine whether the well-reported racial/ethnic differences in asthma treatment are mediated by site of care.

METHODS

The methods used in CHAS have been fully described in separate reports.25,26 In brief, CHAS is an ongoing, prospective study of a socioeconomically and racially diverse community sample of children that aims to investigate the environmental, familial (eg, genetic and household), and health services factors related to childhood asthma severity. Between 1996 and 1998, 1002 families were recruited for study. To be eligible, a family had to have both a newborn infant and a child who was younger than 12 years and had physician-diagnosed asthma. Mothers were approached after delivery at 5 Connecticut hospitals and 1 hospital in southwestern Massachusetts. The following data were collected on the siblings with asthma: health care visits, medication use, and daily symptoms (wheezing, coughing, shortness of breath, and chest tightness) during the preceding 12 months. Although baseline 12-month data were collected on a month-by-month basis, the unit of analysis is the sibling (the data are aggregated across the year) and not patient-month. Siblings were excluded from the current analysis (n = 24) if their mothers could not provide at least 9 months’ worth of data on health care visits, medications, or symptoms. Thus, 978 siblings with asthma were eligible; however, because of missing data and restricted analyses, the sample sizes for the various analyses range to a low of 700.

Independent Variables

The independent variables were race and ethnicity, age (in years), number of scheduled visits for asthma to the regular provider in the previous year, number of urgent asthma visits to the regular provider, symptom severity (described below), insurance status, family income, maternal education, child’s gender, and practice type (described below). Child’s race/ethnicity was determined by parental reports and classified as white, black, and Hispanic (93% of the Hispanics reported being of Puerto Rican descent). Family yearly income was categorized as 0 to $19 999 (n = 274), $20 000 to $39 999 (n = 147), and ≥$40 000 (n = 507). Maternal education was classified as less than high school or equivalent (n = 154), high school or equivalent (n = 261), and more than high school or equivalent (n = 575). Child gender was classified as male (n = 591) and female (n = 350).

The insurance information (private, Medicaid, no insurance) was collected through a supplemental telephone questionnaire. There were 808 respondents to the insurance supplement. Because only 4 participants were reported as not having any health insurance, we restricted the variable to Medicaid (n = 216) and private insurance (n = 588).

Respondents were asked whether their children had regular sources of care, which everyone answered affirmatively. Respondents were also asked to provide the names and locations of the regular providers. From the respondents’ information, we were able to determine practice types by referring to the Folio’s Dictionaries for Connecticut and Massachusetts (1998 and 1999).27 We used the practice type classification provided by the dictionaries. Thirty-five (3%) of the respondents did not provide names or addresses, 247 (25%) provided names but the names and practice information were not located in the dictionaries, and 720 (72%) provided names or addresses that were found in the dictionaries. We were able to determine practice types using the dictionaries when we had the provider name, clinic name, or address. Of the 247 participants who provided names or addresses but the names or addresses were not located in the dictionaries, we were able to classify 153 of them into a practice type on the basis of just the information provided. Thus, we had a total of 873 participants who were categorized into a practice type. Practice types were collapsed into the following 4 categories: ambulatory care center, private arrangement, hospital-based clinic, and unknown.

The validity of our symptom severity measure has been reported elsewhere.25 The symptom severity measure is a 9-point score constructed using 4 self-reported questionnaire items, each measured using 3 categories of symptom duration (none, 1–29 days in last year, and ≥30 days in the last year) for each of wheezing, coughing, shortness of breath, and chest tightness. For each participant, a symptom severity score was computed by summing across the symptoms using the following point distribution: none, 0 points; 1 to 29 days in last year, 1 point; and ≥30 days in last year, 2 points. The range was 0 to 8 (mean: 3.3; standard deviation: 2.1).

Dependent Variables

The medication use variables were aggregated to limit the potential for misclassification as a result of recall bias. The cutoffs of the categories were based both on the distribution of the data and on preliminary tests of proportional odds that showed no qualitative differences when using similar cutoffs. The variables were categorized as follows: 1) for each cromolyn, β2-agonists, inhaled steroids, and systemic steroids, the categories were “none in the last year,” “used 1 to 29 days,” and “used ≥30 days”; 2) for both anticholinergics and theophylline, the categories were “none in the last year” and “ever used in the last year.”

Analysis

Quantitative differences in the independent variables by race (black, white) and Hispanic ethnicity were determined by χ2 for categorical and F test for continuous independent variables. We also compared medication use by site of care (ambulatory care center, private arrangement, and hospital-based clinic) and race and ethnicity using χ2.

Fitting of the multivariate models was based on both conceptual and empirical considerations. Each model was adjusted for race/ethnicity, age, gender, insurance status, symptom severity, number of scheduled visits for asthma to the regular provider in the last year, number of urgent visits for asthma to the regular provider, and practice type.

To test the multivariate effects of race on use of cromolyn, β2-agonists, inhaled steroids, and systemic steroids, we used ordered logistic regression in SAS because the categories of these dependent variables were more than binary.28 Each model was tested for and satisfied the proportional odds assumption. For anticholinergics, we used unconditional logistic regression for binary-dependent variables because the coding was dichotomous. Because a small number of participants used theophylline, we chose not to analyze that medication in a regression model.

To understand the influence of practice type on racial/ethnic disparities in asthma treatment, we fitted a model for β2-agonists and inhaled steroids for children in private practice. We could not separately analyze the “other” category of practice type because of the small subsample size.

RESULTS

The study cohort included 549 white (58%), 139 black (15%), and 255 Hispanic (27%) children. The cohort also included 44 children (4%) in ambulatory care centers (including community clinics), 703 children (72%) in private practice, 126 children (12%) in hospital-based clinics, and 105 children (11%) with unknown practice types.

Table 1 lists the summary statistics for sociodemographics, insurance status, practice type, health care visits, and symptom severity by race and ethnicity. White children were more likely to have private insurance, have families that earned ≥$40 000/year, have mothers with more than a high school education, have been seen in private clinics for regular care, have more scheduled asthma care visits to their regular providers, and have fewer urgent care visits than black and Hispanic children. Black and Hispanic children were more likely to be seen in ambulatory care centers or hospital-based clinics than were white children. There were no differences in age, gender, or reported symptoms.

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TABLE 1.

Characteristics of Sample by Race and Hispanic Ethnicity

Table 2 shows the impact of practice type on medication use. The only significant difference found was for inhaled steroids. A higher proportion of children in private arrangements (15%) used inhaled steroids for ≥30 days compared with those in ambulatory care centers (7%) or hospital-based clinics (7%). Furthermore, a smaller percentage of children in hospital-based clinics used inhaled steroids for 1 to 29 days than those in ambulatory care centers or private arrangements.

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TABLE 2.

Crude Differences in Asthma Medication Use in the Past Year by Practice Type

Table 3 shows the differences by race and Hispanic ethnicity for medication use measures. Black and Hispanic children, in general, used less cromolyn, inhaled steroids, anticholinergics, and systemic steroids than did white children. Compared with white children, a higher percentage of black and Hispanic children did not use β2-agonists, and a higher proportion of white children had used β2-agonists for ≥30 days. Overall, a large proportion of children had not used inhaled steroids in the past year: 73% of white children, 88% of black children, and 94% of Hispanic children.

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TABLE 3.

Differences in Asthma Medication Use in the Past Year by Race/Ethnicity (N = 943)*

Multivariate Models

Table 4 shows the adjusted effects of the selected independent variables on medication use (cromolyn, β2-agonist, inhaled steroid, and systemic steroid use). Models were adjusted for age, gender, insurance type, symptom severity, number of scheduled visits for asthma to the regular provider, number of urgent visits to the regular provider, family income, maternal education, and practice type. Black children used significantly fewer β2-agonists, and black and Hispanic children used significantly fewer inhaled steroids.

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TABLE 4.

Adjusted Odds Ratios for Race/Ethnicity and Medication Use in the Past Year: Logistic Regression* (N = 804)

To understand the influence of practice type, we limited the following analyses to the children seen in private practice settings, which in our previous analyses was associated with the highest quality of medication use (Table 5). In this group, the adjusted association between Hispanic ethnicity versus white race and low use of inhaled steroids remained. The association between low use of β2-agonists and black race versus white race became nonsignificant, although the effect estimate remained essentially unchanged. Lack of precision as a result of small ethnic/racial subsamples is the likely explanation for the widened confidence intervals and nonsignificant results for β2-agonists.

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TABLE 5.

Adjusted Odds Ratios for β2-Agonist and Inhaled Steroid Use in the Past Year by Sample Characteristics Among Children in Private Practice: Logistic Regression* (N = 700)

DISCUSSION

Both racial/ethnic disparities and site-of-care differences in asthma medication utilization were found in CHAS. These differences were not the result of differences in previous patterns of health care usage, symptomatology, insurance status, or other confounding factors. The persistence of these racial/ethnic differences in private practices is an important finding that helps us to understand the diversity of the factors that contribute to racial/ethnic differences in asthma medication use. Ethnic differences were found only for inhaled steroid use, but limited sample sizes in the racial/ethnic strata within the private practice group limited the precision of the effect estimates for β2-agonists. Given that the magnitude of the effect estimates did not change substantially for β2-agonists while the confidence intervals widened (leading to nonsignificant results), future studies might find racial/ethnic associations with larger racial subsamples.

The influence of site of care on medication use is a well-reported phenomenon and can operate through a number of pathways. Rust et al29 reported that community health centers are generally unable to provide quality asthma care to traditionally underserved populations because of a lack of adequate resources. Flores et al24 reported that adherence to practice guidelines was more common in HMOs than in other settings. Other studies have identified provider factors such as imperfect pediatric conformity to clinical practice guidelines, particularly in community- or hospital-based clinics.17,30,31

Our findings add to the previous work by Finkelstein et al,9 who reported that among hospitalized minority children, attendance at nonprivate practice sites of care explained the undertreatment noted in these children before their hospitalization. In the CHAS community sample, nonprivate practice sites were associated with less optimal care, as shown by the lower use of inhaled steroids in the current analyses (Table 2). However, attendance at a private practice site did not ensure that a minority child would receive treatment equivalent to that of a white child.

Our analyses suggest that the relationship between race/ethnicity and asthma medication utilization is mediated through a number of pathways. Simply upgrading the quality of asthma practice patterns at community clinics and hospital outpatient departments will not solve the problem. The association between race and ethnicity and asthma medication utilization will require additional exploration of the patient-physician interaction. In particular, it would be useful to explore the links among the provider, the family, and the system factors associated with disparities in medication use between minorities and nonminorities. A recent article by Mansour et al32 provided some guidance in this regard. The authors reported that among children who had asthma and living in urban areas, the most commonly cited barriers to care were related to patient and family characteristics, health beliefs, and social and physical environments, in contrast to access to health care, health insurance, or continuity of health care.32 Our findings support and extend the findings of Mansour et al because we found that after controlling for primary care contacts, disparities in asthma medication use still exist. Thus, future studies should consider going beyond studying issues of access and focus on parental perceptions and motivators for health care use. Recent studies have also shown that family/maternal factors such as life stressors and poor maternal mental health are associated with poor asthma morbidity and underuse of asthma medications.33,34 Thus, the extent to which poor asthma medication adherence could also be attributable to family stressors should also be explored.

Particular strengths of this study include use of a community sample (rather than a hospital-based sample) of healthy children; consideration of a sociodemographically diverse population of children; and access to a range of questions that deal with not only race and medication use but also primary care contacts, symptomatology, practice teypes, and insurance status. The limitations of this study should also be acknowledged. A limitation of our approach is that it did not identify the differences that might exist in medications according to income level and mothers’ education within the black and Hispanic groups in private arrangements. Our multivariate model adjusted for this across all categories, ignoring the question of possible differences between groups. Our decision to include these factors in the multivariate models reflects our desire to remove their potential confounding effects in those analyses. For understanding the influence of income and education within the private practice, additional analyses, which would involve dividing up the small minority sample within the private practice group into even smaller groups, must be performed. Given the sizes of our stratified samples, it is not possible to perform these required analyses and obtain reliable/precise results. This was confirmed when we fitted separate models that examined the independent effects of income and maternal education on medication use within the black and Hispanic strata. The analyses were underpowered, which was indicated by very wide confidence intervals.

Other limitations include the following. First, it is unknown in this study whether the children who did not take medications did so because they were not prescribed, their families could not afford them, or they were prescribed and affordable but the family failed to fill the prescriptions. Second, the use of retrospective baseline data reported on a month-to-month basis could introduce recall bias; however, our utilization measures were categorized to limit the potential for misclassification as a result of recall bias. Third, our sampling frame at both the hospital and patient level is a convenient one, but with respect to our variables of interest, there is little reason to suspect sampling bias, because we accessed our sample through the birth of a sibling. Fourth, because of limited sample sizes, we were unable to analyze medication use in practice types other than private. Fifth, we had very limited measures on perceived or actual access to care. Thus, we do not know the extent to which the children could not access needed services.

Ending racial/ethnic disparities in asthma treatment will not be simple. Broad-based changes will be needed. Structural changes, which upgrade the resources and practice patterns of community health clinics and hospital outpatient departments, are a necessary start. However, these initiatives alone will reduce but not eliminate the disparities. More work needs to be done to understand the cultural differences that influence how asthma is perceived, acceptance of treatment, and communication with providers. Finally, providers must be better trained to deal with the changing challenges of their increasingly diverse practices.

Acknowledgments

This study was supported by Grants ES-05410 and ES-07456 from the US Public Health Service, National Institute for Environmental Health Science, and an Intergovernmental Personnel Agreement from the Center for Primary Care Research, Agency for Healthcare Research and Quality.

Footnotes

    • Received June 29, 2001.
    • Accepted August 14, 2001.
  • Reprint requests to (A.N.O.) Yale University School of Medicine, Department of Epidemiology and Public Health, Division of Health Policy and Administration, 60 College St, New Haven, CT 06520-8034. E-mail: alexander.ortega{at}yale.edu
  • This article does not necessarily represent the policy of the Agency for Healthcare Research and Quality (AHRQ). The views expressed are those of the authors, and no official endorsement by AHRQ is intended or should be inferred.

HMO, health maintenance organization • CHAS, Childhood Asthma Severity Study

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Pediatrics
Vol. 109, Issue 1
1 Jan 2002
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Impact of Site of Care, Race, and Hispanic Ethnicity on Medication Use for Childhood Asthma
Alexander N. Ortega, Peter J. Gergen, A. David Paltiel, Howard Bauchner, Kathleen D. Belanger, Brian P. Leaderer
Pediatrics Jan 2002, 109 (1) e1; DOI: 10.1542/peds.109.1.e1

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Impact of Site of Care, Race, and Hispanic Ethnicity on Medication Use for Childhood Asthma
Alexander N. Ortega, Peter J. Gergen, A. David Paltiel, Howard Bauchner, Kathleen D. Belanger, Brian P. Leaderer
Pediatrics Jan 2002, 109 (1) e1; DOI: 10.1542/peds.109.1.e1
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