Table 4.

Glossary.

	Term	Recommended conceptual definition
Exposure terminology	Blast	An event that produces a shockwave/soundwave, resulting in a rapid change in atmospheric pressure
	Overpressure	Any transient increase above atmospheric pressure
	Blast event	Specific blast exposure(s) that occur(s) within a specified chronological time frame with clearly distinguishable start and end points; a single blast event can include multiple blast exposures if these were sustained during a single, specific period of time
	Blast exposure	Blast exposure occurs when an individual is close enough to a blast (HLB or LLB) to experience (e.g., physically feel) the shockwave
	Occupational blast exposure	Overpressure blast exposures experienced in the course of performing one's job
	Low-level blast (LLB) exposure	Overpressure exposure generally occurring within operational and training environments from outgoing (user directed) munitions
	High-level blast (HLB) exposure	Overpressure exposure generally experienced in combat settings as a result of incoming or enemy-inflicted munitions, such as IEDs, rocket-propelled munitions, etc.
Overpressure characterization	Peak overpressure	The highest recorded change above ambient pressure (overpressure); typically measured in pounds per square inch (psi) or kilopascals (kPa)
	Impulse overpressure	The total amount of change in pressure over time resulting from a single source; typically measured in pounds per square inch per millisecond (psi/ms)
	Reflective overpressure	The phenomenon in which pressure wave(s) hit object(s), combine, and magnify overpressure
Measurement terminology	Incident sensor orientation	Method of measuring change in ambient static pressure at 90 degrees to the blast origin
	Reflective Sensor Orientation	Method of measuring change in ambient pressure, which includes both static and dynamic pressure, at any orientation other than 90 degrees to the blast origin
Adjectives frequently used to clarify exposures	Repeated	Modifies: exposures An objective term referring to a quantity of exposures >1
	Frequent	Modifies: events A subjective term referring to multiple exposures within a specified time frame, usually short duration
	Acute	Modifies: exposures Refers to an exposure resulting from a single origin at a specific point in time that is relatively short in duration and transient
	Chronic	Modifies: exposures Refers to multiple acute exposures sustained over a prolonged period of time
	Career	Modifies: exposures, events Refers to the sum of exposures/events that occurred over the duration of occupation (typically military career)
	Lifetime	Modifies: exposures, events Refers to the sum of exposures/events that occurred over the person's life span and can include a combination of exposures from multiple careers (e.g., military service and subsequent law enforcement careers) as well as any extra-career exposures
Adjectives frequently used to characterize outcomes	Acute	Modifies: outcomes Refers to outcomes that occur in close temporal proximity to the exposure and are short in duration
	Chronic	Modifies: outcomes Refers to outcomes that occur over time, not necessarily within close temporal proximity to the exposure