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. 2023 Nov 13;13(12):396. doi: 10.1007/s13205-023-03817-3

Table 1.

Factors and levels of variation in central composite design (CCD)

Study type Response Surface
Design type Central composite Runs 20
Design mode Quadratic Blocks—No blocks
Factor Name Units Type Minimum Maximum
A Incubation period Days Numeric 1.98 7.02
B pH Numeric 4.32 7.68
C Temperature °C Numeric 19.89 45.11
Response Name Units Obs Analysis
R1 Xylanase IU/gds 20 Polynomial