Number of blasts the participant has been exposed to prior to his or her current injury.

Blast prior exposure number

TBI: Holden K, Titus M, Van_Tassel P (1999) Cranial magnetic resonance imaging examination of normal term neonates: a pilot study. J Child Neurol 145/9/2011708-710. Pollina J, Dias M, Li V, Kachurek D, Arbesman M (2001) Cranial birth injuries in term newborn infants. Pediatr Neurosurg 35: 113-119. Looney C, Smith J, Merck L, Wolfe H, Chescheir N, Hamer R, Gilmore J (2007) Intracranial hemorrhage in asymptomatic neonates: prevalence on MR images and relationship to obstetric and neonatal risk factors. Radiology 242: 535-541. Whitby E, Griffiths P, Rutter S, Smith M, Sprigg A, Ohadike P, Davies N, Rigby A, Paley M (Lancet) Frequency and natural history of subdural haemorrhages in babies and relation to obstetric factors. 2004 363: 846-851. Towner D, Castro M, Eby-Wilkens E, Gilbert W (1999) Effect of mode of delivery in nulliparous women on neonatal intracranial injury. N Engl J Med 341: 1709-1714.

TBI: This element should be collected in studies including military populations.

Number of prior blast prior exposures