Table 2 Box-Behnken experimental design employed for development of chicken nuggets

Experiment No.	Coded variables			Experimental response
				Oven cooked nuggets			Steam cooked nuggets			Microwave cooked nuggets
	x1	x2	x3	OAA	Firmness	Toughness	OAA	Firmness	Toughness	OAA	Firmness	Toughness
1	0	0	0	6.67	13.05	76.12	7.33	11.12	75.95	6.50	9.55	63.12
2	0	0	0	6.67	11.88	72.57	7.33	10.15	66.56	6.50	9.24	65.77
3	1	1	0	7.17	11.10	69.47	7.50	9.01	59.36	6.83	8.42	58.55
4	1	0	–1	7.50	9.44	67.39	7.58	7.72	53.82	7.33	7.85	54.86
5	–1	0	–1	7.00	9.36	72.56	7.33	8.18	57.41	7.00	8.50	70.40
6	–1	–1	0	6.17	12.63	87.55	6.42	12.11	86.43	6.00	9.76	72.25
7	0	–1	1	5.67	13.65	97.65	6.17	12.53	86.67	5.84	12.22	84.18
8	1	0	1	6.33	12.89	78.84	6.67	11.57	76.82	6.00	11.16	83.71
9	–1	1	0	6.33	11.64	71.31	7.17	9.36	72.63	6.50	9.11	79.56
10	0	1	–1	7.33	9.97	76.44	7.58	7.85	54.98	7.17	8.99	68.58
11	1	–1	0	6.50	12.12	83.51	7.00	9.15	70.63	6.67	8.74	68.91
12	0	0	0	6.67	12.93	78.37	7.33	11.35	75.44	6.50	9.50	63.42
13	0	0	0	6.67	12.55	74.56	7.17	10.75	69.18	6.50	9.38	66.47
14	0	0	0	6.50	12.25	75.99	7.17	10.75	63.66	6.83	9.40	62.45
15	0	–1	–1	7.33	9.56	71.68	7.50	8.66	56.38	7.00	8.88	65.58
16	0	1	1	6.33	13.50	82.97	6.67	11.86	82.71	6.00	11.35	78.44
17	–1	0	1	6.00	12.61	84.30	6.17	12.45	85.55	5.67	11.98	86.14

OAA, overall acceptability; n=18 for OAA and n=6 for firmness and toughness, mean values are presented for each experiment.