Table 1: Repartition of paratroopers suspected of concussion according to diagnostic criteria. CONCUSSION’S DIAGNOSTIC CRITERIA NUMBER OF PARATROOPERS PERCENTAGE Traumatic brain injury 58 29% Traumatic brain injury and loss of consciousness 19 10% Traumatic brain injury and other diagnostic criteria 61 30% Diagnostic criteria without traumatic brain injury, included : 63 - Loss of consciousness 2 31 % - Amnesia 1 - Being “groggy / stunned” 60 Prevalence according to morphological characteristicsdrops” is too high to prove any difference between the and static-line parachuting experience two groups. Table 2 presents morphological characteristics andPost-concussion syndrome prevalence experience of static-line parachuting in the study’s population. Table 3 presents symptoms mentioned by the 201 para- troopers suspected of a concussion long after the trau- The only statistically significant difference observedmatic drops. Combination of “cervical pain” and “hea- between the groups was the sex. In this population,dache” is reported by 46 paratroopers, representing women are at 2.5 times more at risk to suffer concus-22% of them. sion than men. However, we could not demonstrate a statistically significant difference between paratroo-Among the 201 paratroopers suspected of concussion, pers suspected or not of concussion, according to age,some have not reported any symptoms longtime after height, and seniority in airborne troops. The amount of theirparachute drop, yet others mentioned one or missing data for “weight”, “BMI”,and “number ofseveral symptoms. Table 2: Description of paratroopers suspected and non-suspected of concussion according to their morphology and experience in static line parachuting. VARIABLES UNIVARIATE ANALYSIS MULTIVARIATEANALYSIS Concussion No concussion p OR [IC 95%] p N=201 N=693 Age, year mean (DS) 30,5 (6,6) 29,0 (7,0) 0,008 1 0,9-1,0 0,08 Missing 1 7 Gender, N (%) Male 178 (89,0) 663 (95,8) 0,001 1 1,3-5,1 0,01 Female 22 (11,0) 29 (4,2) 2,5 Missing 1 1 Size, cm Mean (DS) 174,9 (7,6) 176,4 (6,4) 0,008 1 0,9-1,0 0,2 Missing 11 84 Weight, kg Mean (DS) 74,4 (9,6) 74,4 (8,3) 0,9 Missing 15 121 Body mass index, kg.m-2 Mean (DS) 23,9 (2,2) 23,5 (2,1) 0,03 Missing 15 123 Number of drop, N Mean [IQR] 60 [30-60] 30 [13-67] 0,0001 Extrems 2-250 1-250 Missing 113 387 Senority, year Mean [IQR] 8 [4,5-13] 5,0 [2-9] 0,0001 1,1 1,0-1,2 0,0001 Extrems 1-24 1-34 VOL. Missing 16 81 94/3 International Review of the Armed Forces Medical Services 21 Revue Internationale des Services de Santé des Forces Armées