Table 4.
Changes in Plasma Levels of SHPT Indicators, voice analysis, and Subjective Voice Assessment Results Before and 3 Months After Parathyroidectomy.
| Variables | Preoperative | Postoperative | p value |
|---|---|---|---|
| Plasma levels | |||
| Calcium (mg/dL) | 10.00 ± 1.03 | 8.24 ± 1.44 | .000* |
| Phosphorus (mg/dL) | 5.33 ± 1.34 | 3.72 ± 1.55 | .040* |
| iPTH (pg/mL) | 1216.23 ± 767.05 | 88.73 ± 166.51 | .000* |
| Aerodynamic† | |||
| F0 (Hz) | 178.03 ± 42.91 | 236.55 ± 83.79 | .010* |
| Male | 146.85 ± 34.67 | 167.09 ± 48.07 | .267 |
| Female | 203.92 ± 38.24 | 231.44 ± 36.14 | .178 |
| MPT (s) | 13.39 ± 5.64 | 14.48 ± 3.85 | .922 |
| s (s) | 11.91 ± 5.70 | 13.17 ± 9.84 | .988 |
| z (s) | 14.57 ± 7.25 | 14.93 ± 4.65 | .744 |
| Acoustic‡ | |||
| Jitter (%) | 1.41 ± 0.84 | 0.84 ± 0.35 | .047* |
| Shimmer (dB) | 0.38 ± 0.18 | 0.24 ± 0.09 | .033* |
| NHR | 0.13 ± 0.03 | 0.13 ± 0.03 | .342 |
| Perceptual | |||
| GRBAS Sum | 0.464 ± 0.63 | 0.273 ± 0.47 | .344 |
iPTH, intact parathyroid hormone; F0, fundamental frequency; MPT, maximum phonation time; s, voiceless “s” produced without vibration of vocal folds; z, voiced “z” produced with vibration of vocal folds; NHR, noise-to-harmonics ratio.
†Aerodynamic parameters through video strobe laryngoscopy.
‡Acoustic parameters through Computerized Speech Laboratory.
*Student t test.