Table 3.

Characteristics of subjects who were outliers on their GFAP difference scores.

Age	Gender	Mechanism of injury	Injury to blood sampling (hours)	CT result	GOS-E outcome	Plasma GFAP (pg/mL)	Serum GFAP (pg/mL)	GFAP difference (plasma – serum)
80	Male	GLF	1.3	Abnormal	Poor	1,001.8	2,613.8	−1,612.0*
89	Female	GLF	2.9	Abnormal	Poor	243.5	1,064.1	−820.6*
75	Male	Sport	7.2	Not Done	Poor	4,420.0	4,813.8	−393.8
88	Female	GLF	4.5	Abnormal	Poor	886.4	492.6	393.8
92	Female	GLF	1.4	Abnormal	Poor	630.2	188.6	441.6
89	Female	GLF	4.8	Abnormal	Poor	1,863.0	1,372.2	490.7
81	Female	GLF	3.8	Normal	Poor	1,288.3	788.3	500.0
83	Female	Fall	5.3	Abnormal	Poor	1,941.2	1,382.7	558.5
77	Male	GLF	2.9	Abnormal	Poor	1,792.7	1,191.1	601.5
61	Male	GLF	5.1	Abnormal	Poor	1,490.1	846.6	643.4
89	Female	GLF	3.6	Normal	Poor	4,027.7	3,382.4	645.3
68	Female	Fall	3.3	Abnormal	Poor	2,857.2	2,057.9	799.3*
95	Male	GLF	5.9	Abnormal	Poor	3,152.8	2,341.0	811.8*
69	Male	GLF	3.1	Normal	Good	1,283.3	218.4	1,064.8*
78	Female	GLF	5.4	Normal	Poor	1,651.9	323.2	1,328.7*
72	Male	GLF	3.8	Abnormal	Poor	4,296.4	2,212.9	2,083.5*
89	Female	GLF	8.3	Abnormal	Poor	6,838.6	2,640.7	4,197.8*
						M = 2,333.2	M = 1,643.0	M = 690.3
						Md = 1,792.7	Md = 1,372.2	Md = 601.5

Outliers were defined as GFAP difference values that were >1.5 times the IQR. Extreme outliers (GFAP difference values >3 times the IQR) are denoted with an asterisk. CT, computed tomography; GFAP, glial fibrillary acidic protein; GLF, ground-level fall; GOS-E, Glasgow Outcome Scale-Extended.