Table 3 Scheme of experimental factors in the coding space after orthogonalization.

From: Quantitative relationship between hippocampal injury and mechanical load and body weight in closed head injury of male rats using quadratic orthogonal regression

Test group

Factors

Polynomial coefficient

x1

x2

f

a

b

c

d

e

0.3 MPa-L

− 1

− 1

1

− 1

− 1

1

1

1

0.3 MPa-M

− 1

0

1

− 1

0

1

− 2

0

0.3 MPa-H

− 1

1

1

− 1

1

1

1

− 1

0.5 MPa-L

0

− 1

1

0

− 1

− 2

1

0

0.5 MPa-M

0

0

1

0

0

− 2

− 2

0

0.5 MPa-H

0

1

1

0

1

− 2

1

0

0.7 MPa-L

1

− 1

1

1

− 1

1

1

− 1

0.7 MPa-M

1

0

1

1

0

1

− 2

0

0.7 MPa-H

1

1

1

1

1

1

1

1

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