The accumulation of multiple adverse social determinants of health is linked to worse disease at initial presentation and worse disease activity over time in children with rheumatologic conditions, according to findings presented at the annual scientific meeting of the Childhood Arthritis and Rheumatology Research Alliance.
One study revealed that cumulative factors conferring social disadvantage progressively increased the odds of active disease and functional disability in children with juvenile idiopathic arthritis (JIA). Another study similarly found that children with lupus living in neighborhoods with comparatively fewer resources for childhood opportunity had worse disease at presentation and greater disease activity over follow-up.
, William Daniel Soulsby, MD, of the University of California San Francisco, told attendees in his presentation of data from the JIA study.
“Most prior studies have analyzed such determinants as independent risk factors,” Dr. Soulsby said. “However, individuals experiencing social disadvantage often face multiple social hardships that rarely act in isolation; studying these factors independently may miss underlying disparities.”
Stacy P. Ardoin, MD, MSc, professor of pediatric and adult rheumatology at Nationwide Children’s Hospital and The Ohio State University in Columbus, and vice president of CARRA, did not find the results of Soulsby’s study surprising, but she said they do “provide important confirmation of our growing understanding of the impact of social determinants of health on the outcomes of children and adolescents with chronic disease like juvenile idiopathic arthritis.” She added: “In medicine, we often think about the bench, the bedside, and the clinic, but this study tells us that if we want to improve outcomes for our patients, we also need to think about the ‘backyard,’ too.”
Social Disadvantage With JIA
Dr. Soulsby’s team adopted an approach similar to that of a recent National Survey of Children’s Health analysis that used a combined scoring system to calculate cumulative social disadvantage. The researchers used income level, insurance status, and education level to capture individual factors related to disadvantage and then an area deprivation index (ADI) to capture community factors. While they were unable to use any variables specific to societal factors, they included race, which is relevant at all three levels.
The cohort included 9612 patients in the CARRA Registry from July 2015 to January 2022. They included all patients who had a JIA diagnosis with onset before age 16 and at least one visit with a complete clinical Juvenile Arthritis Disease Activity Score (JADAS) score. Most of the patients (70%) were female, with an average age at enrollment of 11 and a mean time to diagnosis of 10.6 months.
Most of the patients had oligoarthritis (35.5%) or rheumatoid factor–negative polyarthritis (29.4%), followed by enthesitis-related arthritis (10.5%) and then other forms. A total of 4% of patients had a secondary rheumatologic condition. Most of the patients were White (74.9%), with 3.9% Black, 7.6% Hispanic, and 6.5% of more than one race. ADI data were missing for 17.2% of patients.
The researchers assigned a score to each patient that could add up to a maximum of 3. They received 1 point for an annual household income below $50,000, 1 point for having public insurance or no insurance, and 1 point for their guardian having no more than a high school education. Patients with a score of 0 comprised 60.9% of the patients, while 21.3% had a score of 1, 12.9% had a score of 2, and 4.9% had a score of 3.
Just over a quarter of the patients (26.3%) were underinsured, 19.1% were low income, and 16.4% had caregivers with a high school education or less. However, income level was unknown for 24.6% of patients, and guardians’ education level was unknown for 15.7% of patients.
The primary outcomes were the odds of active disease as based on clinical JADAS (at least a 1.1 score for oligoarticular JIA and more than 2.5 for all other subtypes) and odds of functional disability based on the Childhood Health Assessment Questionnaire (CHAQ). Adjustments were made for sex, race/ethnicity, age at enrollment, time to diagnosis, ADI, JIA category, presence of secondary rheumatologic disease, and medication (use of a conventional synthetic disease-modifying antirheumatic drug [DMARD], biologic DMARD, or small molecule drug).
Nearly half (48%) of patients had active disease during follow-up, with an average clinical JADAS score of 4 from the whole cohort. Compared with children with a cumulative disadvantage score of 0, each additional point on the clinical JADAS resulted in significantly increased odds of active disease. Those with the highest score of 3 were twice as likely to have active disease (adjusted odds ratio [aOR], 2.05; P < .001) as those with a score of 0, but those with a score of 1 (aOR, 1.36; P < .001) or 2 (aOR, 1.86; P < .001) were also more likely to have active disease. Other significant independent predictors of active arthritis included being of Black race (aOR, 1.55) or more than one race (aOR, 1.31).
Each of the scored factors also independently increased the likelihood of active disease by similar amounts: 1.69 higher odds for low household income on its own, 1.6 higher odds for public or no insurance, and 1.45 higher odds for high school education or less (all P < .001).
Similarly, odds of functional disability based on CHAQ increased significantly with each additional point. The mean CHAQ score was 0.31, and 46% of patients had functional disability during follow-up. Those with a cumulative social disadvantage score of 3 were three times as likely to have functional disability (aOR, 3.09; P < .001) as those with a score of 0. Those with a score of 1 (aOR, 1.82) or 2 (aOR, 2.81) were also more likely to have functional disability (P < .001). Again, Black individuals (aOR, 2.09) or those of mixed race (aOR, 1.78) had greater odds of functional disability (P < .001).
The independent factor most associated with increased odds of functional disability was a household income below $50,000 a year (OR, 3.03; P < .001), followed by having public or no insurance (OR, 2.57) or a caregiver with no more than a high school education (OR, 1.98). Dr. Soulsby noted that their study was limited by the missing data and may oversimplify the relationships between social determinants of health.
Overall, however, the findings revealed both the importance of social risk screening in the pediatric rheumatology clinic and the coupling of that screening with individual level support for patients, Dr. Soulsby said.
“This study did a great job of harnessing the power of the CARRA Registry,” said Dr. Ardoin, who was not involved in the research. “These findings underscore how important it is for all clinicians, including pediatric rheumatologists, to evaluate every child for social risks of poor outcomes,” she said.
One take-home message from the findings is that once pediatric rheumatologists identify social risks for poor outcomes in their patients, they can “consult with social workers and connect families with community resources in an effort to ameliorate social deprivation.”