Background: To estimate the associations between ambient particulate matter (PM) pollution of different sizes (PM, PM, and PM) and risk of rehospitalization among stroke patients, as well as the attributable burden in China.
Methods: We built a cohort of 1,066,752 participants with an index stroke hospitalization in Sichuan, China from 2017 to 2019. Seven-day and annual average exposures to PM pollution prior to the date of the index hospitalization were linked with residential address using a bilinear interpolation approach. Cox proportional hazard models were constructed to assess the association between ambient PM and the risk of rehospitalization. The burden of stroke rehospitalization was estimated using a counterfactual approach.
Results: 245,457 (23.0 %) participants experienced rehospitalization during a mean of 1.15 years (SD: 0.90 years) of follow-up. Seven-day average concentrations of PM were associated with increased risk of rehospitalization: the hazard ratios (HRs) per 10 μg/m were 1.034 (95 % confidence interval [CI]: 1.029-1.038) for PM, 1.033 (1.031-1.036) for PM, and 1.030 (1.028-1.031) for PM; the hazard ratios were larger for annual average concentrations: 1.082 (1.074-1.090) for PM, 1.109 (1.104-1.114) for PM, and 1.103 (1.099-1.106) for PM. The associations were stronger in participants who were female, of minority ethnicity (non-Han Chinese), who suffered from an ischemic stroke, and those admitted under normal conditions. Population attributable fractions for stroke rehospitalization ranged from 4.66 % (95 % CI: 1.69 % to 7.63 %) for the 7-day average of PM to 17.05 % (14.27 % to 19.83 %) for the annual average of PM; the reducible average cost of rehospitalization per participant attributable to PM ranged from 492.09 (178.19 to 806) RMB for the 7-day average of PM to 1801.65 (1507.89 to 2095.41) RMB for the annual average of PM.
Conclusions: Ambient PM pollution may increase the risk of rehospitalization in stroke patients and is responsible for a significant burden of stroke rehospitalization.
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