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Table 6 Effect evaluation of two regression models from the Box–Behnken design, for the release of soluble proteins and amino acids

From: New keratinolytic bacteria in valorization of chicken feather waste

Variable Effect Standard error t value p value
Release of soluble proteins
 Intercept 5.8502 0.0353 165.5901 < 0.0001
 X1 0.9987 0.0865 11.5410 < 0.0001
 X2 − 0.3983 0.0865 − 4.6020 0.0037
 X3 0.0172 0.0865 0.1990 0.8488
 X1X1 0.1400 0.0612 2.2878 0.0621
 X2X2 − 0.1122 0.0612 − 1.8332 0.1165
 X3X3 − 0.2128 0.0612 − 3.4768 0.0132
 X1X2 − 0.0194 0.1224 − 0.1585 0.8792
 X1X3 − 0.3359 0.1224 − 2.7446 0.0335
 X2X3 − 0.0680 0.1224 − 0.5552 0.5988
Release of amino acids
 Intercept 99.9512 6.8766 14.5349 < 0.0001
 X1 89.8828 16.8442 5.3361 0.0018
 X2 46.1902 16.8442 2.7422 0.0336
 X3 − 18.3162 16.8442 − 1.0874 0.3186
 X1X1 41.7277 11.9107 3.5034 0.0128
 X2X2 27.8740 11.9107 2.3403 0.0578
 X3X3 3.8631 11.9107 0.3243 0.7567
 X1X2 53.1504 23.8214 2.2312 0.0672
 X1X3 1.9315 23.8214 0.0811 0.9380
 X2X3 − 15.3856 23.8214 − 0.6459 0.5423