Table 1. Criteria for event inclusion in the study for venous thromboembolism and cerebrovascular events in patients with GCA and non-GCA subjects^*.

Deep vein thrombosis(definite)	Verified by venography, ultrasound, or thrombus removedduring surgery or autopsy.
Deep vein thrombosis(probable)	Confirmatory tests indeterminate or not done but all the following were present: a) physician diagnosis present in medical record, b) signs and symptoms consistent with deep vein thrombosis documented in exam, and c) patient underwent therapy with anticoagulant (heparin, warfarin, or similar agent).
Pulmonary embolism	Verified by pulmonary angiography, CT/MRI angiography, ventilation-perfusion lung scan (interpreted as high probability), or thrombus removed during surgery or autopsy.
Ischemic stroke	Focal neurological deficit persisting > 24 hours, compatible with altered circulation to a limited region of brain parenchyma, diagnosed by a neurologist (CT/MRI confirmation optional).
Hemorrhagic stroke	Acute onset of focal neurologic deficit associated with headache, vomiting, altered level of consciousness, signs of meningeal irritation, and blood stained cerebrospinal fluid. Diagnosis made by neurologist. If done, CT/MRI showed parenchymal hemorrhage.
Transient ischemic attack	Transient period of ≤ 24 hours of neurologic dysfunction caused by focal brain ischemia without evidence of acute infarction on neuroimaging or clinical evidence of permanent injury or neurologic sequelae.
Amaurosis fugax	Transient monocular visual disturbance with abrupt onset and rapid resolution, lasting < 24 hours and due to altered circulation to the optic nerve.

*GCA = giant cell arteritis

CT = computed tomography; MRI = magnetic resonance imaging