Statistically significant phenolic compounds responsible for the differentiation of Retsina samples according to the three parameters under investigation
| Factor | Stageexamined | Compound | AUC of ROC※ | P-value(t-test) | Log2 fold change† |
|---|---|---|---|---|---|
| Altitude | Intermediate point (stage “a”) | Isorhamnetin | 0.89 | 5.71E-03 | –0.71 |
| Quercetin | 0.88 | 8.42E-03 | –0.68 | ||
| Gallocatechin | 0.77 | 3.82E-02 | –0.34 | ||
| Tapping method | Maturation and aging | Epicatechin | 0.73 | 1.76E-02 | –0.25 |
| Gallocatechin | 0.71 | 3.54E-02 | –0.18 | ||
| Caftaric acid | 0.70 | 5.46E-02 | –0.09 | ||
| Contact time | End of fermentation (stage “b”) | Glutathione | 1.00 | 8.02E-05 | –1.08 |
| Isorhamnetin | 0.89 | 4.93E-03 | –0.31 | ||
| Ethyl caffeate | 0.91 | 7.80E-03 | –0.54 | ||
| Quercetin | 0.91 | 1.32E-02 | –0.32 | ||
| Kaempferol | 0.84 | 3.03E-02 | –0.26 |
※: area under the curve (AUC) of receiver operating characteristic (ROC); †: a negative Log2 fold change indicates a direction towards group of microclimate A for altitude, short extraction time and conventional harvesting