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Effect modification by high-concentration duration in the association between particulate matters and stroke hospital admissions among hypertension patients in Beijing, China

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Abstract

To investigate the associations between particulate matter (PM) and hospital admissions for stroke and its subtypes among hypertension patients. We proposed a new modifier named high-concentration duration (HCD). Data on daily hospital admissions, air pollution, and meteorological factors were collected from 2014 to 2018 in Beijing, China. We included all patients with hypertension who were admitted to hospitals of secondary-level and above for stroke. Time-series analysis was conducted by fitting a generalized additive model. An interaction term of daily concentration and an HCD stratum indicator were included in the model. Sex subgroup analysis was performed in four age groups to detect vulnerable populations. A total of 358,577 admissions were identified. The PM was significantly associated with stroke admissions in patients with hypertension. The maximum excess risk (ER) (%) per 10 μg/m3 increase in fine particulate matter (PM2.5) was 0.23% (95% confidence interval (CI): 0.15%, 0.31%) for overall stroke, 0.25% (95% CI: 0.16%, 0.33%) for ischemic stroke (IS). The maximum ER (%) per 10 μg/m3 increase in inhalable particle (PM10) was 0.14% (95% CI: 0.06%, 0.23%) for overall stroke, 0.15% (95% CI: 0.06%, 0.23%) for IS. For hemorrhagic stroke, significant associations were also observed among males and patients < 55 years. ER (%) in long-HCD strata was significantly larger than that in short-HCD strata. The effects of PM2.5 were significant in long-HCD strata, but insignificant in short-HCD strata. HCD might be a modifier in the association between air pollution and health effects. While controlling the daily average concentration, it is also important to reduce HCD on a given day.

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Data availability

The datasets and code generated and analyzed during the current study are not publicly available due to the confidentiality agreement.

Abbreviations

PM:

Particulate matter

IS:

Ischemic stroke

HS:

Hemorrhagic stroke

HCD:

High-concentration duration

GAM:

Generalized additive model

ER:

Excess risk

CI:

Confidence interval

PM2.5 :

Fine particulate matter

PM10 :

Inhalable particle

DALYs:

Disability-adjusted life years

DECH:

Daily excessive concentration hours

SO2 :

Sulfur dioxide

NO2 :

Nitrogen dioxide

CO:

Carbon monoxide

O3 :

Ozone

CO2 :

Carbon dioxide

DOW:

Day of the week

df:

Degree of freedom

RR:

Relative risk

References

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Acknowledgements

We appreciate the Beijing Municipal Health Commission Information Center and the Beijing Air Pollution and Metrological Data Center.

Funding

This work was supported by the National Natural Science Foundation of China (grant number 81773512), Scientific Research Common Program of Beijing Municipal Commission of Education (grant number KM201810025008), and “Practical Training Plan” of Beijing Municipal Education Commission.

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Authors and Affiliations

Authors

Contributions

Zemeng Zhao: conceptualization, methodology, software; writing—original draft, writing—review and editing; Moning Guo: data curation, resources, writing—review and editing; Peng Tan: data curation, conceptualization, writing—review and editing; Xue Tian: formal analysis, writing—review and editing; Yuhan Zhao: software; writing—review and editing; Lulu Liu: methodology, writing—review and editing; Lili Luo: writing—review and editing; Hui Luo: writing—review and editing; Xiaonan Wang: supervision, writing—review and editing; Xiangtong Liu: supervision, writing—review and editing; Xiuhua Guo: supervision, writing—review and editing; Yanxia Luo: funding acquisition, conceptualization, supervision, writing—review and editing, and project administration. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Yanxia Luo.

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This is an observational study, so no ethical approval is required.

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This is an ecological study which does not involve individual participants, so no informed consent is required.

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This study does not involve human participants or animals, so informed consent and statement on welfare of animals is not required.

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The authors declare no competing interests.

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Zhao, Z., Guo, M., Tan, P. et al. Effect modification by high-concentration duration in the association between particulate matters and stroke hospital admissions among hypertension patients in Beijing, China. Air Qual Atmos Health 16, 2325–2335 (2023). https://doi.org/10.1007/s11869-023-01412-2

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  • DOI: https://doi.org/10.1007/s11869-023-01412-2

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