Table 2.

Correlation analysis results of maximal EtOH production, initial pH, and pH at maximal EtOH concentration.

	Initial pH-max		pH at max		Initial pH-pH at
Inocula	[EtOH]		[EtOH]-max [EtOH]		[EtOH]max
	τ	p-value	τ	p-value	τ	p-value
All	-0.455	0.045	-0.412	0.063*	0.565	0.011
C. faeces∗∗	0.061	0.840*	0.078	0.730*	0.791	0.000
Rumen	0.708	0.002	0.626	0.005	0.657	0.003
Sludge	-0.600	0.01	-0.564	0.017	0.382	0.121*

τ, Kendalls’s τ. ^∗Not significant at 95% confidence level. ^∗∗Data did not meet the linear covariation assumption for correlation test validity.