Table 1.

Definition on mTBI/concussion from various NATO countries.

Country	LOC	PTA	AOC	GCS	Additional
USA	0–30 min	Up to 24 h	Up to 24 h	NA	Permanent/transient neurological defects possible intracranial lesion
UK	0–30 min	Up to 24 h	Up to 24 h	No <13 at 30 min post injury	Possible transient neurological abnormality
Canada	Possibility	Possibility	Yes	NA	Must include head injury event
Netherlands	<15 min	<1 h	NA	NA	Closed head injury