1. Definitions of status epilepticus followed in various studies.

Study	Definition
Alldredge 2001	Continuous or repeated seizure activity > 5 minutes without recovery of consciousness.
Leppik 1983 (mixed)	(a) Generalised tonic‐clonic status: three or more generalised tonic‐clonic seizures in one hour; two or more generalised seizures in rapid succession without recovery of consciousness; (b) absence status: confusional state with generalised 3 Hz spike wave pattern on EEG; (c) complex partial status: confusional state, clinical seizure or both with focal EEG abnormality; (d) elementary status: partial seizures without loss of consciousness.
Pellock 1998 (premonitory)	Acute repetitive seizures (no definition).
Remy 1991 (mixed)	Successive partial seizures for at least 20 minutes or two generalised tonic‐clonic seizures within 20 minutes.
Shaner 1988 (established/mixed)	Generalised convulsive status epilepticus: (a) a history of 30 minutes of continuous generalised convulsive seizures and witnessed generalised seizures in the emergency room; (b) a history of 30 minutes of recurrent generalised convulsive seizures but failure to attain baseline mental status between seizures and witnessed generalised seizures in the emergency room; (c) a history of 3 or more generalised convulsive seizures in one hour in patients with obtundation prior to the onset of status epilepticus and witnessed generalised convulsive seizures in the emergency room; (d) uncertain history of seizures but generalised convulsive seizures continuously for more than 5 minutes as witnessed in the emergency room.
Singhi 2002 (refractory)	Motor seizures uncontrolled after 2 doses of diazepam and phenytoin infusion.
McCormick 1999 (unclear)	No definition.
Chamberlain 1997 (premonitory)	Motor seizures of at least 10 minutes duration.
Appleton 1995 (unclear)	No definition.
Treiman 1998 (premonitory)	Overt generalised convulsive status: two or more generalised convulsions or continuous convulsive activity > 10 minutes.
Cereghino 2002 (premonitory)	Multiple seizures of complex partial or generalised type within an observation period between 12 ‐ 24 hours.
Misra 2011	Two or more convulsive seizures without full recovery of consciousness between the seizures or continuous convulsions lasting for more than five minutes.
Mehta 2007	30 minutes of continuous seizure activity or two or more sequential seizures without full recovery of consciousness between seizures.
Chen 2011	More than five minutes of continuous seizures or two or more discrete seizures between which there is incomplete recovery of consciousness.
Agarwal 2007	Continuous, generalized, convulsive seizure lasting greater than 5 minutes, or two or more seizures during which patient does not return to baseline consciousness.
Ahmad 2006	Generalized convulsions continuing for minimum of five minutes.
Rossetti 2011	Continuous, generalized, convulsive seizure lasting greater than 5 minutes, or two or more seizures during which patient does not return to baseline consciousness.
Silbergleit 2012	Continuous convulsions for longer than five minutes or having convulsions at the time of treatment after having intermittent seizures without regaining consciousness for longer than five minutes.
Sreenath 2010	Continuous convulsive activity lasting for 5 minutes or more.