Data collected and analyzed
The demographic information collected include age, sex, residence, smoke and alcohol history, medical history from the medical record. Vehicle to hospital, duration from onset to admission were collected shortly after admission from patients or escorts. SBP/DBP, hematoma location, hematoma volume, and laboratory data were copied from medical record. SMASH-U flow-chart was adopted to classify the most likely cause for each ICH event, including structural vascular lesions (S), medication (M), amyloid angiopathy (A), systemic disease (S), hypertension (H), undetermined (U)5. Modified ranking scale (mRS) score was assessed centrally by face-to-face interview if the patient survive at 3 months.