Traffic-related air pollution associated with chronic kidney disease among elderly residents in Taipei City
2018
Chen, Szu-Ying | Chu, Da-Chen | Lee, Jui-Huan | Yang, Ya-Ru | Chan, Chang-Chuan
The associations of air pollution with chronic kidney disease (CKD) have not yet been fully studied. We enrolled 8,497 Taipei City residents older than 65 years and calculated the estimated glomerular filtration rate (eGFR) using the Taiwanese Chronic Kidney Disease Epidemiology Collaboration equation. Proteinuria was assessed via dipstick on voided urine. CKD prevalence and risk of progression were defined according to the KDIGO 2012 guidelines. Land-use regression models were used to estimate the participants’ one-year exposures to PM of different sizes and traffic-related exhaust, PM₂.₅ absorbance, nitrogen dioxide (NO₂), and NOₓ. Generalized linear regressions and logistic regressions were used to examine the associations of one-year air pollution exposures with eGFR, proteinuria, CKD prevalence and risk of progression. The results showed that the interquartile range (IQR) increments of PM₂.₅ absorbance (0.4 × 10⁻⁵/m) and NO₂ (7.0 μg/m³) were associated with a 1.07% [95% confidence interval (CI): 0.54–1.57] and 0.84% (95% CI: 0.37–1.32) lower eGFR, respectively; such relationships were magnified in subjects who had an eGFR >60 ml/min/1.73 m² or who were non-diabetic. Similar associations were also observed for PM₁₀ and PM₂.₅₋₁₀. Two-pollutant models showed that PM₁₀ and PM₂.₅ absorbance were associated with a lower eGFR. The odd ratios (ORs) of CKD prevalence and risk of progression also increased with exposures to PM₂.₅ absorbance and NO₂. In summary, one-year exposures to traffic-related air pollution were associated with lower eGFR, higher CKD prevalence, and increased risk of CKD progression among the elderly population. Air pollution-related impaired renal function was stronger in non-CKD and non-diabetic subjects.
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