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The partial correlation between the salt taste threshold and various variables when smoking is used as a covariate.
| The partial correlation of salt taste threshold | r | p value |
|---|---|---|
| (1) Age | 0.085 | 0.479 |
| (2) Salivary volume | 0.017 | 0.885 |
| (3) Salivary pH | −0.079 | 0.512 |
| (4) Systolic BP | 0.306 | 0.009 |
| (5) Diastolic BP | 0.171 | 0.150 |
| (6) MMP-9 | 0.038 | 0.753 |
