Table 1. Clinicopathological characteristics of the concordant and discordant groups.
| Characteristics | Concordant (n=137) | Discordant (n=54) | P value |
|---|---|---|---|
| Age (year) | 51.9±11.5 (18 to 75) | 55.3±12.7 (18 to 74) | 0.071 |
| Gender, n (%) | 0.264 | ||
| Male | 37 (27.0) | 18 (33.3) | |
| Female | 100 (73.0) | 36 (66.7) | |
| Size of parathyroid (cm) | 1.9±0.8 | 1.6±0.9 | 0.070 |
| USG, n (%) | 0.001 | ||
| Positive (single) | 133 (97.1) | 19 (35.2) | |
| Positive (unilateral multiple) | 1 (0.7) | 1 (1.8) | |
| Positive (bilateral multiple) | 3 (2.2) | 3 (5.6) | |
| Negative | 0 | 31 (57.4) | |
| MIBI, n (%) | 0.001 | ||
| Positive (single) | 133 (97.1) | 25 (46.3) | |
| Positive (unilateral multiple) | 1 (0.7) | 1 (1.9) | |
| Positive (bilateral multiple) | 3 (2.2) | 4 (7.4) | |
| Negative | 0 | 24 (44.4) | |
| Serum calcium (mg/dL) | |||
| Before operation | 11.6±1.4 | 11.5±0.9 | 0.654 |
| 6-month after operation | 9.0±0.4 | 9.2±0.7 | 0.048 |
| Serum intact PTH (pg/mL) | |||
| Before operation | 215±280 | 202±281 | 0.783 |
| 6-month after operation | 44±44 | 40±26 | 0.569 |
| Serum alkaline phosphatase (IU/L) | |||
| Before operation | 142±195 | 128±178 | 0.640 |
| 6-month after operation | 92±67 | 72±33 | 0.160 |
| BMD | |||
| Before operation | −1.9±1.3 | −2.0±1.1 | 0.851 |
| 1-year after operation | −1.4±1.1 | −1.6±1.0 | 0.485 |
| 2-year after operation | −1.4±1.3 | −1.6±1.1 | 0.476 |
| Operation time (minutes) | |||
| FP | 41.8±16.5 | 44.5±10.7 | 0.438 |
| UE | 58.4±19.4 | 70.1±35.6 | 0.253 |
| BNE | 80.6±23.3 | 86.3±34.2 | 0.618 |
| Recurrence or persistent, n (%) | 2 (1.5) | 2 (3.7) | 0.586 |
| Period of follow up (months) | 98.2±52.8 | 108.6±49.3 | 0.281 |
| Multiple lesions on pathology, n (%) | 1 (0.7) | 7 (13.0) | 0.001 |
| Histology, n (%) | 0.015 | ||
| Adenoma | 131 (95.6) | 44 (81.5) | |
| Hyperplasia | 6 (4.4) | 10 (18.5) | |
| Operation type, n (%) | 0.001 | ||
| FP | 107 (77.9) | 23 (42.6) | |
| UE | 23 (16.9) | 8 (14.8) | |
| BNE | 7 (5.1) | 23 (42.6) |
Reference range of serum intact PTH (pg/mL, 10–65), Serum calcium (mg/dL, 8.6–10.2), Serum alkaline phosphatase (IU/L, 40–120). USG, ultrasonography; MIBI, sestamibi; PTH, parathyroid hormone; BMD, bone mineral density; FP, focused parathyroidectomy; UE, unilateral exploration; BNE, bilateral neck exploration.