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Table 3 Coded levels of factors in the experiments suggested by Box–Behnken design

From: Conversion of lignocellulosic waste into effective flocculants: synthesis, characterization, and performance

Run Coded levels of the factorsa
A B C
1 − 1  + 1 0
2 − 1 0  + 1
3 0 − 1 − 1
4  + 1  + 1 0
5 − 1 − 1 0
6 0  + 1 − 1
7  + 1 0 − 1
8  + 1 − 1 0
9 0  + 1  + 1
10 0 0 0
11 0 − 1  + 1
12 0 0 0
13 − 1 0 − 1
14 0 0 0
15  + 1 0  + 1
  1. aA epichlorohydrin, B triethylamine, C cellulose suspension