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. 2017 Oct 17;8:2021. doi: 10.3389/fmicb.2017.02021

Table 1.

Levels of the code values and none code values based on single factor (ion) experiments.

Independent variables Code None code Code levels (mg/L)
-1 0 1
Mg2+ X1 A 1000 1500 2000
Fe2+ X2 B 1.2 2.2 3.2
Zn2+ X3 C 3.0 26.5 50.0

The relations between the code values and none code values were as follows. X1 = (A-1500)/500, X2 = (B-2.2)/1, X3 = (C-26.5)/23.5.