TABLE 3.

Parameters used in the first logistic regression model for survival and death of S. aureus in pasteurized milk after bacteriophage treatment^a

Parameter	Estimate	SE	Z	P value	95% confidence interval
					Lower	Upper
Intercept	1.449	2.030	0.714	0.475	−2.530	5.427
B	4.161	1.308	3.181	0.001	1.597	6.725
T·B	−0.082	0.025	−3.276	0.001	−0.130	−0.033
B·P	−0.458	0.129	−3.541	<0.001	−0.711	−0.204

^aBacteriophage treatment was according to the experimental design shown in Table 1. The parameters were retained coefficients, their confidence limits, and fit evaluation. Abbreviations: T, temperature (°C); B, initial bacterial contamination (log₁₀ CFU/ml); and P, initial phage titer (log₁₀ PFU/ml). Values for and from statistical analyses are as follows: log likelihood (LL) of constants-only model, i.e., LL(0), −40.381; 2·[LL(N) − LL(0)], 47.158; degree of freedoms, 3; P value, <0.001; Hosmer-Lemeshow value, 4.670; McFadden's rho-squared value, 0.584; Naglekerke's R-squared value, 0.736.