Correction to: Scientific Reports https://doi.org/10.1038/s41598-020-68754-0, published online 16 July 2020

The Article contains errors in the speech quantity “Median F0 values” which is incorrectly given as “Median intensity” in the Abstract, Methods, Results, Discussion, Conclusion and Tables 2, 3 and 4.

In the Abstract,

“The results indicated that the mean f0, max f0, min f0, jitter, duration of speech and median intensity of speaking for the PD patients were significantly different from those of the healthy controls.”

should read:

“The results indicated that the mean f0, max f0, min f0, jitter, duration of speech and median F0 values of speaking for the PD patients were significantly different from those of the healthy controls.”

In the Methods, under the subheading ‘Acoustic parameter extraction’,

“The acoustic parameters included (a) start f0 (Hz), (b) mean f0 (Hz), (c) mid f0 (Hz), (d) minimum f0 (Hz), (e) maximum f0 (Hz), (f) end f0 (Hz), (g) slope from the maximum f0 to the end of the call (slope M-E; Hz/s), (h) slope from the start f0 of the call to the maximum f0 (slope S-M; Hz/s), (i) median intensity (Hz), (j) duration of speaking (seconds) (k) harmonics-to-noise ratio (HNR, Hz) and (l) jitter (the absolute f0 difference between consecutive f0 measurements/the average period).”

should read:

“The acoustic parameters included (a) start f0 (Hz), (b) mean f0 (Hz), (c) mid f0 (Hz), (d) minimum f0 (Hz), (e) maximum f0 (Hz), (f) end f0 (Hz), (g) slope from the maximum f0 to the end of the call (slope M-E; Hz/s), (h) slope from the start f0 of the call to the maximum f0 (slope S-M; Hz/s), (i) median F0 values (Hz), (j) duration of speaking (seconds) (k) harmonics-to-noise ratio (HNR, Hz) and (l) jitter (the absolute f0 difference between consecutive f0 measurements/the average period).”

In the Results,

“Similarly, the end f0 in the single syllable and double syllable tests, the slope S-M in the single syllable test and the median intensity in the multiple syllable test of the PD female patients were significantly higher than those of the controls.”

should read:

“Similarly, the end f0 in the single syllable and double syllable tests, the slope S-M in the single syllable test and the median F0 in the multiple syllable test of the PD female patients were significantly higher than those of the controls.”

“The other acoustic parameters were risk factors, including the age, smoking habit, education, end f0, HNR and median intensity.”

should read:

“The other acoustic parameters were risk factors, including the age, smoking habit, education, end f0, HNR and median F0.”

“Interestingly, the median intensity and duration were significantly positively correlated with the H&Y and UPDRS III in the single syllable results (P < 0.05, R > 0). However, all the syllables of median intensity were related to the VHI-30.”

should read:

“Interestingly, the median F0 and duration were significantly positively correlated with the H&Y and UPDRS III in the single syllable results (P < 0.05, R > 0). However, all the syllables of median F0 were related to the VHI-30.”

In the Discussion,

“Our data revealed significant differences in the mean f0, min f0, max f0, duration and jitter in male participants between the two groups and significant changes in the min f0, max f0, end f0, slope S-M and median intensity in female participants between the two groups (see Table 2).”

should read:

“Our data revealed significant differences in the mean f0, min f0, max f0, duration and jitter in male participants between the two groups and significant changes in the min f0, max f0, end f0, slope S-M and median F0 in female participants between the two groups (see Table 2).”

“This factor measures the rate of airflow caused by the coordinated movement of lung muscles. In addition, our data revealed that the median intensity of male PD patients was higher than that of the control group in the overall syllable test. Similarly, the female PD patients also presented a higher median intensity than the controls. However, only during the multiple syllable test did female PD patients present significantly higher intensity than the control group. The median intensity represents the intensity of vocalization. Having a low voice is also one of the symptoms of PD patients.“

should read:

“This factor measures the rate of airflow caused by the coordinated movement of lung muscles. In addition, our data revealed that the median F0 of male PD patients was higher than that of the control group in the overall syllable test. Similarly, the female PD patients also presented a higher median F0 than the controls. However, only during the multiple syllable test did female PD patients present significantly higher intensity than the control group. The median F0 represents the intensity of vocalization. Having a low voice is also one of the symptoms of PD patients.”

“Conversely, the Z-values from the regression analysis indicated that the acoustic parameters of end f0, HNR and the median intensity were greater than zero, signifying that they are negative factors.”

should read:

“Conversely, the Z-values from the regression analysis indicated that the acoustic parameters of end f0, HNR and the median F0 were greater than zero, signifying that they are negative factors.”

In the Conclusion,

“The mean f0, max f0, min f0, jitter, duration and median intensity of speaking in PD patients were significantly different from those of the healthy controls. The end f0, slope M-E, median intensity, duration, HNR and jitter are related to the clinical severity of PD.”

should read:

“The mean f0, max f0, min f0, jitter, duration and median F0 of speaking in PD patients were significantly different from those of the healthy controls. The end f0, slope M-E, median F0, duration, HNR and jitter are related to the clinical severity of PD.”

The correct Tables 2, 3 and 4 and accompanying legends appear below.

Table 2 Comparison of mean values in sound parameters between PD and control patients.
Full size table
Table 3 Regression analysis result of acoustic parameters among all participants.
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Table 4 Correlation between clinical severity of PD and acoustic parameters.
Full size table