Table 2.

Estimates for coded data and t-test in a second order response surfaces for inactivation percentage for L. monocytogenes (LIS), natural accompanying microflora (NAM), and L. delbruekii (LAC).

Term	LIS			NAM			LAC
	Estimate	Std. Err	t value	Estimate	Std. Err	t value	Estimate	Std. Err	t value
Time	0.30	0.05	6.42**	0.73	0.12	6.11 **	0.19	0.07	2.81 **
Power	1.52	0.05	31.62**	2.25	0.12	18.50 **	1.52	0.07	21.60 **
Pulse	−0.64	0.05	−14.09**	−0.13	0.12	−1.10 ns	−0.15	0.07	−2.26 *
Time2	−0.12	0.08	−1.47 ns	−0.12	0.21	−0.56 ns	−0.06	0.12	−0.53 ns
TimexPower	0.27	0.07	4.15 **	0.20	0.17	1.19 ns	0.26	0.10	2.65 *
TimexPulse	−0.10	0.06	−1.61 ns	0.11	0.16	0.66 ns	0.01	0.09	−0.05 ns
Power2	0.26	0.08	3.18 **	0.51	0.21	2.48 *	1.00	0.12	8.44 **
PowerxPulse	−0.43	0.06	−6.68 **	−0.51	0.16	−3.10 **	−0.34	0.09	−3.66 **
Pulse2	0.13	0.08	1.69 **	−1.38	0.19	−7.09 **	−0.18	0.11	−1.60 ns
Adjusted R-square	92.9%			81.6%			85.0%
Coefficient of Variation	14.0%			23.0%			34.0%

* p < 0.05, ** p < 0.01, ns p ≥ 0.05.