Table 12: Comparison of stimulated whole salivary urea between three types of antidepressant drugs.
| Parameter | Group | Mean | SD | t value | D/F | P value | Results |
| Urea(mg/dl) | TCA versus SSRI | 60.22 | 10.71 | 8.06 | 31 | P<0.0001 | S |
| 34.58 | 7.60 | ||||||
| SSRI versus TeCA | 34.58 | 7.60 | 1.94 | 35 | P=0.0600 | NS | |
| 30.02 | 6.48 | ||||||
| TCA versus TeCA | 60.22 | 10.71 | 9.59 | 28 | P<0.0001 | S | |
| 30.02 | 6.48 |
SD: Standard deviation, S: Significant, D/F: Degrees of freedom, NS: Non‑significant, TCA: Tricyclic antidepressant, SSRI: Selective serotonin reuptake inhibitor, TeCA: Tetracyclic antidepressants