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    Table 1 Abbreviations

    Abbreviation

    Definition

    CI

    Confidence interval

    CSDH

    Chronic subdural haematoma

    DAVF

    Dural arteriovenous fistula

    HCO

    Health care organisation

    HR

    Hazard ratio

    MMA

    Middle meningeal artery

    MMAE

    Middle meningeal artery embolisation

    mRS

    Modified Rankin Scale

    NASH

    Non-acute subdural haematoma

    NBCA

    n-butyl-2-cyanoacrylate

    NIS

    National inpatient sample

    MRA

    Magnetic resonance angiography

    MRI

    Magnetic resonance imaging

    OR

    Odds ratio

    PVA

    Polyvinyl alcohol

    RCT

    Randomised controlled trial

    SD

    Standard deviation

    SDH

    Subdural haematoma

    SEM

    Standard error of the mean

    SEPS

    Subdural evacuating port system