Table 2.

Correlation coefficients between HPMC and FC GAE, FRAP, ABTS and DPPH, as well as with RACI for coffee and coffee surrogates brews (at 95% confidence limit)

	HPMC	FRAP	ABTS	DPPH	RACI
Coffee brews
FC GAE	0.969 p < 0.01	0.969 p < 0.01	0.970 p < 0.01	0.920 p < 0.01	0.987 p < 0.01
RACI	0.984 p < 0.01	0.992 p < 0.01	0.991 p < 0.01	0.957 p < 0.01
DPPH	0.918 p < 0.01	0.965 p < 0.01	0.956 p < 0.01
ABTS	0.961 p < 0.01	0.982 p < 0.01
FRAP	0.961 p < 0.01
Coffee substitutes brews
FC GAE	0.885 p = 0.02	0.896 p = 0.02	0.957 p < 0.01	0.957 p < 0.01	0.975 p < 0.01
RACI	0.922 p < 0.01	0.963 p < 0.01	0.938 p < 0.01	0.987 p < 0.01
DPPH	0.950 p < 0.01	0.949 p < 0.01	0.894 p = 0.02
ABTS	0.773 p = 0.08	0.834 p = 0.04
FRAP	0.910 p < 0.01