Table 3.

The factors included in the PBD and the importance ranking

Variable	Coefficient	t-test	P>|t|	Ranking
Interception	6248	272.46	0
A	−1.84	−0.08	0.943	20
B	−122.34	−5.34	0.013	7
C	12.34	0.53	0.631	19
D	−24.00	−1.05	0.372	16
E	−84.84	−3.71	0.034	10
F	−42.34	−1.85	0.161	15
G	−42.66	−1.87	0.158	14
H	226.00	9.85	0.002	2
J	122.84	5.36	0.013	7
K	−61.00	−2.66	0.076	11
L	17.00	0.75	0.508	17
M	97.16	4.24	0.024	9
N	13.16	888.90	0.570	18
O	138.34	6.03	0.009	5
P	−52.84	−2.30	0.105	12
Q	−131.00	−5.71	0.011	6
R	180.16	7.84	0.004	4
S	51.00	2.23	0.112	13
T	349.00	15.21	0.001	1
U	200.34	8.73	0.003	3

A: Glucose; B: Xylose; C: Maltose; D: Lactose; E: Sucrose; F: Mannose; G: Galactose; H: Yeast extract; J: Peptone; K: Raffinose; L: Beef extract; M: (NH₄)₂SO₄; N: KH₂PO₄; O: MgSO₄; P: FeSO₄; Q: CaCl₂; R: Na₂CO₃; S: NaNO₂; T: NaNO₃; U: Urea