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The partial correlation between the sweet taste threshold and various variables when smoking is used as a covariate.
| The partial correlation of sweet taste threshold | r | p value |
|---|---|---|
| (1) Age | −0.016 | 0.896 |
| (2) Salivary volume | 0.115 | 0.336 |
| (3) Salivary pH | 0.179 | 0.132 |
| (4) Glucose level | 0.049 | 0.682 |
| (5) MMP-9 | −0.131 | 0.272 |
