Table 1.

MPT and acoustic analysis of the vocal /e/ after treatment: laser (n = 19) or radiotherapy (n = 18)

Variable	Laser	Radiotherapy
MPT	11.83 ± 5.28	8.63 ± 3.23	P < 0.05
F0 (Hz)	173.39 ± 47.41	199.04 ± 51.46	NS
Jitter (%)	0.44 ± 0.24	0.72 ± 0.91	NS
Shimmer (%)	5.08 ± 4.72	4.07 ± 4.04	NS
NNE (dB)	−5.82 ± 2.98	−5.02 ± 4.44	NS

MPT maximum phonation time, F₀ (Hz) fundamental frequency, NNE normalized noise energy