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. 2009 Mar 1;40(1):54–60. doi: 10.1590/S1517-83822009000100008

Table 2.

Main effects of the variables on protease production (2^8-3 fractional design).

Factor	Effect	p
Mean	0.180^*	0.001^*
KH₂PO₄	-0.077^*	0.014^*
(NH₄)₂SO₄	0.024	0.121
KOH	0.164^*	0.003^*
MgSO₄.7H₂O	-0.032	0.076
Fe(SO₄)₃.6H₂O	0.031	0.0820
Thiamine	-0.014	0.264
Biotin	-0.026	0.111
Dried yeast cells	0.128^*	0.005^*

^*

Statistically significant values (p < 0.05).