Table 5.

Outcomes data.

Was the patient admitted to intensive care after the operation at any point during the 14-day follow up period?	Yes, No If yes, date of admission to ICU … If yes, was the patient discharged from ICU during the 14-day follow up period? Yes, No If yes, date of discharge from ICU …
Surgical site infection	Yes, No If yes, was it a superficial/deep incisional infection (i.e. scalp wound) or organ/space infection (i.e. bone flap osteitis, meningitis and/or empyema/abscess)? Superficial or deep incisional infection, Organ/space infection If yes, how was it diagnosed? Tick all that apply. Symptoms, Signs on examination, Blood tests, Imaging, Wound swab microscopy, Wound swab Gram stain, Wound swab culture, CSF microscopy, CSF Gram stain, CSF culture, Surgical diagnosis
Did the patient return to the operating theatre for cranial surgery during the current admission?	Yes, No If yes, what was the re-operation? Re-evacuation of ipsilateral haematoma, Infection - wound washout, Infection - removal of bone flap, Craniectomy, Cranioplasty, Evacuation of contralateral haematoma, Other neurosurgical procedure
Did the patient survive to the end of the follow up period (14 days post-operatively or until they were discharged from hospital, whichever came first)?	Yes, No Was the patient still admitted to hospital on the 14th day post-operatively? Yes, No
Date of death or discharge from your institution (as applicable)	…
Discharge destination (if applicable)	Transfer to another hospital, Transfer to rehabilitation unit, Usual place of residence, Absconded, Other (state)
Glasgow Coma Scale at discharge or at the end of the follow up period if not discharged at 14 days post-operatively (if applicable)	Total and Eyes, Verbal (‘T’ if intubated/tracheostomy), Motor (option for ‘Unknown’)