Table 2 Factor table for coding space experiments.

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

x1

x2

Empty

Empty

\(y_{i}\)

0.3 MPa-L

− 1

− 1

1

1

\(y_{1}\)

0.3 MPa-M

− 1

0

2

2

\(y_{2}\)

0.3 MPa-H

− 1

1

3

3

\(y_{3}\)

0.5 MPa-L

0

− 1

2

3

\(y_{4}\)

0.5 MPa-M

0

0

3

1

\(y_{5}\)

0.5 MPa-H

0

1

1

2

\(y_{6}\)

0.7 MPa-L

1

− 1

3

2

\(y_{7}\)

0.7 MPa-M

1

0

1

3

\(y_{8}\)

0.7 MPa-H

1

1

2

1

\(y_{9}\)

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