Table 2. Hypocalcemia and relevant serological parameters associated with surgical extent.
| Variable | Surgical extent | P value | |||||
|---|---|---|---|---|---|---|---|
| A | B | C | A vs. B | B vs. C | A vs. C | ||
| Hypocalcemia, n (%) | <0.05 | 0.04 | <0.05 | ||||
| Normal | 62 (64.6) | 81 (54.0) | 83 (43.9) | ||||
| Asymptomatic | 25 (26.0) | 28 (18.7) | 57 (30.2) | ||||
| Symptomatic | 9 (9.4) | 41 (27.3) | 49 (25.9) | ||||
| Serum calcium (mmol/L), mean ± SD | |||||||
| POD 0 | 2.39±0.14 | 2.40±0.13 | 2.38±0.13 | 0.34 | 0.18 | 0.87 | |
| POD 1–7 | 2.08±0.24 | 2.03±0.28 | 2.00±0.26 | 0.09 | 0.45 | 0.02 | |
| POD >7 | 2.24±0.13 | 2.20±0.15 | 2.13±0.19 | 0.06 | <0.05 | <0.05 | |
| PTH (pg/mL), mean ± SD | |||||||
| POD 0 | 41.50±14.53 | 41.79±17.65 | 42.93±13.72 | 0.89 | 0.49 | 0.46 | |
| POD 1–7 | 23.88±9.74 | 22.56±13.09 | 18.81±11.40 | 0.39 | 0.003 | 0.001 | |
| POD >7 | 29.74±10.72 | 28.76±11.76 | 25.67±12.25 | 0.53 | 0.02 | 0.006 | |
| Total | 96 | 150 | 189 | ||||
A, TT plus anterior laryngeal and trachea LND only; B, TT + unilateral tracheoesophageal groove LND; C, TT + bilateral tracheoesophageal groove LND. PTH, parathyroid hormone; POD, postoperative day.