TY - JOUR
T1 - Maximum Phonation Time: Variability and Reliability
AU - Speyer, Renee
AU - Bogaardt, Hans C. A.
AU - Passos, Valeria Lima
AU - Roodenburg, Nel P. H. D.
AU - Zumach, Anne
AU - Heijnen, Marielle A. M.
AU - Baijens, Laura W. J.
AU - Fleskens, Stijn J. H. M.
AU - Brunings, Jan W.
PY - 2010/5
Y1 - 2010/5
N2 - The objective of the study was to determine maximum phonation time reliability as a function of the number of trials, days, and raters in dysphonic and control subjects. Two groups of adult subjects participated in this reliability study: a group of outpatients with functional or organic dysphonia versus a group of healthy control subjects matched by age and gender. Over a period of maximally 6 weeks, three video recordings were made of five subjects' maximum phonation time trials. A panel of five experts were responsible for all measurements, including a repeated measurement of the subjects' first recordings. Patients showed significantly shorter maximum phonation times compared with healthy controls (on average, 6.6 seconds shorter). The averaged interclass correlation coefficient (ICC) over all raters per trial for the first day was 0.998. The averaged reliability coefficient per rater and per trial for repeated measurements of the first day's data was 0.997, indicating high intrarater reliability. The mean reliability coefficient per day for one trial was 0.939. When using five trials, the reliability increased to 0.987. The reliability over five trials for a single day was 0.836; for 2 days, 0.911; and for 3 days, 0.935. To conclude, the maximum phonation time has proven to be a highly reliable measure in voice assessment. A single rater is sufficient to provide highly reliable measurements.
AB - The objective of the study was to determine maximum phonation time reliability as a function of the number of trials, days, and raters in dysphonic and control subjects. Two groups of adult subjects participated in this reliability study: a group of outpatients with functional or organic dysphonia versus a group of healthy control subjects matched by age and gender. Over a period of maximally 6 weeks, three video recordings were made of five subjects' maximum phonation time trials. A panel of five experts were responsible for all measurements, including a repeated measurement of the subjects' first recordings. Patients showed significantly shorter maximum phonation times compared with healthy controls (on average, 6.6 seconds shorter). The averaged interclass correlation coefficient (ICC) over all raters per trial for the first day was 0.998. The averaged reliability coefficient per rater and per trial for repeated measurements of the first day's data was 0.997, indicating high intrarater reliability. The mean reliability coefficient per day for one trial was 0.939. When using five trials, the reliability increased to 0.987. The reliability over five trials for a single day was 0.836; for 2 days, 0.911; and for 3 days, 0.935. To conclude, the maximum phonation time has proven to be a highly reliable measure in voice assessment. A single rater is sufficient to provide highly reliable measurements.
KW - Voice
KW - Maximum phonation time
KW - Reliability
KW - Interrater reliability
KW - Intrarater reliability
KW - Repeated measures
U2 - 10.1016/j.jvoice.2008.10.004
DO - 10.1016/j.jvoice.2008.10.004
M3 - Article
C2 - 19111437
SN - 0892-1997
VL - 24
SP - 281
EP - 284
JO - Journal of Voice
JF - Journal of Voice
IS - 3
ER -