Characterization of Closed Head Impact Injury in Rat

Table 2

Assignment of six factors and their selected levels in the L₈(2⁷) orthogonal array and predicted peak maximum principal strain (MPS) in the cerebrum, hippocampus, and cerebellum.

Case number	Factors							Predicted peak MPS
	A	B	C	D	E	F		Cerebrum	Hippocampus	Cerebellum
1	1	3	Central	6	Steel	Flat		0.1775	0.1466	0.1535
2	1	3	Lateral	6	Nylon	Convex		0.2283	0.1593	0.0326
3	1	6	Central	12	Steel	Convex		0.2061	0.0912	0.0494
4	1	6	Lateral	12	Nylon	Flat		0.4080	0.2993	0.1261
5	2	3	Central	12	Nylon	Flat		0.6192	0.3644	0.3890
6	2	3	Lateral	12	Steel	Convex		0.3744	0.3080	0.1238
7	2	6	Central	6	Nylon	Convex		0.3047	0.2204	0.1976
8	2	6	Lateral	6	Steel	Flat		0.4982	0.4092	0.2893

A (impact depth, mm), B (impact velocity, m/s), C (impact position), D (impactor diameter, mm), E (impactor material), and F (impactor shape).