Predicted probability of arthritis-attributable moderate/severe joint pain in adults aged 25 to 80 years, by state. Predicated probabilities are adjusted for age, sex, race/ethnicity, and state’s percentage of immigrants. All estimates are sample weight adjusted. Bars show 95% confidence intervals. Pain (2023). DOI: 10.1097/j.pain.0000000000002945
The prevalence of moderate or severe joint pain due to arthritis varies strikingly across American states, ranging from 6.9% of the population in Minnesota to 23.1% in West Virginia, according to a new study led by a University at Buffalo researcher.
The paper published in the journal PAIN is providing new insights—through its novel combination of individual- and macro-level measures—into geographic differences in pain and their causes.
“The risk of joint pain is over three times higher in some states compared to others, with states in the South, especially the lower Mississippi Valley and southern Appalachia, having particularly high prevalence of joint pain,” says Rui Huang, a sociology Ph.D. student in the UB College of Arts and Sciences, and the paper’s first author.
“We also observed educational disparities in joint pain in all states that vary substantially in magnitude, even after adjusting for demographic characteristics.”
The percentage point difference in pain prevalence between people who did not complete high school versus those who obtained at least a bachelor’s degree is much larger in West Virginia (31.1), Arkansas (29.7), and Alabama (28.3) than in California (8.8), Nevada (9.8) and Utah (10.1).
“Education can function as a ‘personal firewall’ that protects more highly educated people from undesirable state-level contexts, while increasing the vulnerability of less educated individuals,” says Huang.
Nearly 59 million people in the U.S. have arthritis, and at least 15 million of them experience severe joint pain because of that condition. Severe joint pain is associated with diminished range of motion, disability and mortality.
While existing research on the social determinants of pain has relied primarily on individual-level data, individuals are embedded in social contexts, such as a specific U.S. state.
Different states can have dramatically different policies that affect many aspects of life including opportunities, resources and social relationships, which can in turn influence individuals’ pain, a potential influence that has gone largely unexplored in previous research.
“Very little research has examined the geography of chronic pain, and virtually none has examined the role of state-level policies in shaping pain prevalence,” says Hanna Grol-Prokopczyk, Ph.D., UB associate professor of sociology, and a co-author of the study. “We were excited to identify state characteristics that reduce residents’ risk of pain.”
The current study does so by combining data on nearly 408,000 adults (ages 25-80) from the 2017 Behavioral Risk Factor Surveillance System with state-level data about SNAP programs (formerly known as food stamps), Earned Income Tax Credits, income inequality, social cohesion (relationship strength among community members), Medicaid Generosity Scores, and tobacco taxes.
Although SNAP programs exist in all 50 states, some states offer more expansive benefits to qualifying residents than others. States with more generous SNAP benefits had a lower prevalence of pain. The same was true for states with greater social cohesion, indicating that both material resources and social functioning play critical roles in shaping pain risk.
“The increase in the generosity of SNAP benefits could potentially alleviate pain by promoting healthier eating habits and alleviating the life stress associated with food insecurity,” says Huang. “Social factors such as conflict, isolation and devaluation are also among the ‘social threats’ that can lead to physical reactions such as inflammation and immune system changes.”
In addition to providing new information on pain disparities across states, the paper might also fuel a reorientation of pain research that puts equal emphasis on macro- and individual-level factors, according to Huang.
“Chronic pain can—and should—be addressed through macro-level policies, as well as through individual-level interventions,” says Huang. “This study also implies that pain research in general should move towards a greater understanding of the macro contextual factors that shape pain and pain inequalities.”
More information:
Rui Huang et al, Educational disparities in joint pain within and across US states: do macro sociopolitical contexts matter?, Pain (2023). DOI: 10.1097/j.pain.0000000000002945
Journal information:
Pain
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Pain risk varies significantly across American states, finds study (2023, July 7)
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