Table 2. Stepwise forward multiple regression models for PROP phenotype (threshold and bitterness intensity).
| PROP phenotype | Variable | Overall model | Parameter estimate | Each step | |||
|---|---|---|---|---|---|---|---|
| (adj R2) | (p) | (sr) | (p) | (R2) | |||
| Threshold | Gustin | 0.3101 | <0.001 | -0.38 | <0.001 | 0.1772 | |
| TAS2R38 | -0.31 | 0.005 | 0.2890 | ||||
| Age | 0.23 | 0.031 | 0.3435 | ||||
| Bitterness intensity | TAS2R38 | 0.5516 | <0.001 | 0.65 | <0.001 | 0.4975 | |
| Gustin | 0.26 | 0.004 | 0.5593 | ||||
Independent variables for both models included: Gustin genotypes, TAS2R38 genotypes, age and gender. Only the significant variables are indicated. Adj, adjusted; sr, semipartial correlation.