Predicting the Impact of Air Quality Index on Rheumatoid Arthritis Disease Activity
Authors' conclusion
These findings emphasize the importance of air quality management in mitigating the impact of environmental factors on RA, suggesting that exposure to elevated levels of NO2 and O3 beyond regulatory standards could exacerbate RA symptoms.
Study context
- Population
- Patients with rheumatoid arthritis (RA) in the Kuwait Registry for Rheumatic Diseases; air-quality data from six monitoring stations across Kuwait
- Outcome
- RA disease activity (DAS28) in relation to air pollutants (sulfur dioxide, NO2, O3, particulate matter ≤10 micrometers, nitrogen oxide, carbon monoxide)
Methodological detailssix air-monitoring stations across Kuwait, Vector Error Correction Model and cointegration analysis
- Six air-monitoring stations across Kuwait
- Vector Error Correction Model and cointegration analysis
Main finding
As reported in the abstract
NO2, lag effect of two months, correlating with increased RA disease activity: effect score
0.43
P < 0.01
O3, lag effect of three months, correlating with increased RA disease activity: effect score
0.31
P < 0.05
Observational data: associations, not effects.
Further findings
Long-term cointegration between predicted and actual DAS28 (Vector Error Correction Model), adjusted over the following year using air quality index
- Error correction term (negative and significant; strong long-term cointegration)
- −0.54 (P < 0.001)
Original publication
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