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. 2016 Feb 17;7(3):381–390. doi: 10.1016/j.jare.2016.02.003

Table 1.

Independent variables and their levels used for CCD.

Independent variables Unit Symbol Coded levels
−α −1 0 +1 +α
Temperature °C X1 40.00 47.00 57.50 68.00 75.00
pH – X2 5.50 6.30 7.50 8.70 9.50
Phytate concentration mM X3 0.50 1.00 1.75 2.50 3.00