Risk of postoperative hypocalcemia and hospitalization (primary outcomes)
| Unadjusted OR (95% CI) | P value | Adjusted OR (95% CI) | P value | |
| Total calcium (<8 mg/dL) | 3.9 (3.0 to 5.0) | <0.01 | 2.2 (1.6 to 3.1) | <0.01 |
| Corrected calcium (<8 mg/dL) | 2.8 (2.2 to 3.7) | <0.01 | 1.5 (1.1 to 2.1) | 0.02 |
| Hospitalization | 1.3 (1.0 to 1.7) | 0.03 | 1.3 (0.9 to 1.8) | 0.13 |
Adjusted for age, race, urban/rural status, neck dissection, preoperative serum calcium and preoperative serum magnesium.