Table 3.

Adjusted regression equations and respective coefficients of determination (R²) to the reduction in E. coli O157:H7 (log N₀/N) count as a function of the ozone exposure period (x) in different substrates (S) and in the concentrations (C) of 35 and 45 mg L⁻¹

C (mg L−1)	S	Adjusted equation	R 2	SEE
35	UHWM	y⌢ = 0.007 + 0.033 x	0.95	0.10
	HWM	$\stackrel{⌢}{y}=0.077+0.009x$	0.64	0.09
	SM	$\stackrel{⌢}{y}=0.005+0.004x$	0.88	0.02
	LFSM	$\stackrel{⌢}{y}=0.144+0.054x$	0.91	0.23
	LFWM	$\stackrel{⌢}{y}=0.069+0.024x$	0.95	0.08
	DW	$\stackrel{⌢}{y}=3.978\left(1-e^{\left(-0.808x\right)}\right)$	0.99	0.01
45	UHWM	y⌢ = 0.007 + 0.036x	0.95	0.11
	HWM	$\stackrel{⌢}{y}=0.102+0.012x$	0.68	0.11
	SM	y⌢ =  − 0.012 + 0.004x	0.89	0.02
	LFSM	y⌢ = 0.201 + 0.053x	0.87	0.28
	LFWM	$\stackrel{⌢}{y}=0.157+0.025x$	0.79	0.17
	DW	$\stackrel{⌢}{y}=3.941\left(1-e^{\left(-0.945x\right)}\right)$	0.99	0.01

UHWM, unhomogenized whole milk; HWM, homogenized whole milk; SM, skim milk; LFSM, lactose-free skim milk; LFWM, lactose-free whole milk; DW, distilled water; SEE, standard error of estimate

n = 3 sample replicates