Table 3.

Statistical parameters for sequential models.

Source	Sum of squares	Degrees of freedom	Mean square	F-value	p-value
Linear	11.39	3	3.80	21.55	<0.0001
2FI	0.025	3	8.446 × 10−3	0.039	0.9891
Quadratic	2.73	3	0.91	130.90	<0.0001
Cubic	0.066	4	0.016	28.79	0.0005