Overview of attribute testing with mean scores based on 39 of the 40 persons in the test panel that replied on these parameters, and with values ranging from 1 to 5 where 1 is low in bitterness, graininess or coffee flavour
| Sample | Bitterness | Graininess | Coffee flavour |
|---|---|---|---|
| Control | 2.4 | 1.9 | 3.0 |
| Oven dried | 2.8 | 2.5 | 2.7 |
| Vacuum dried | 2.7 | 3.3 | 2.4 |
| Freeze dried | 2.2 | 2.4 | 2.0 |
| P values | P = 0.05 | P < 0.001 | P < 0.01 |
The P values are from a chi square test of significance comparing the numbers for muffins baked with oven dried, freeze dried and vacuum dried SCG powder, and the control with espresso powder. SCG: spent coffee grounds