Table 1.

Baseline characteristics of population.

Characteristic	Cases		Controls		p-value
	n	%	n	%
Age
Younger (20–23 years)	40	53.3	39	52.0	0.87
Older (24–35 years)	35	46.7	36	48.0
Gender
Male	50	66.7	50	66.7	1.00
Female	25	33.3	25	33.3
Race
White	60	80.0	60	80.0	1.00
Black	15	20.0	15	20.0
Deployment length
Short (6 to <12 months)	55	73.0	57	76.0	0.71
Long (12–18 months)	20	27.0	18	24.0
Time between deployment end and postdeployment serum sample draw
≤7 days	42	56.0	38	50.7	0.51
>7 days	33	44.0	7	49.3
Time between predeployment serum draw and start of deployment
≤90 days	52	69.3	46	61.3	0.30
>90 days	23	30.7	29	38.7