In the full phase 1 sample, the odds of having tinnitus increased by about 10 percent for each 1 dB increase in the median LM sensation level (p = 0.02).
Abbreviations: ANSI = American National Standards Institute, AUC = area under Receiver Operating Characteristic curve, dB HL = decibels hearing level, dB SL = decibels sensation level, dB SPL = decibels sound pressure level, FCDS = forced-choice double staircase, IOM = Institute of Medicine, LM = loudness match, MML = minimum masking level, PM = pitch match, PTA = pure tone average, PVAMC = Portland VA Medical Center, RI = residual inhibition, ROC = Receiver Operating Characteristic, SBC = Schwartz Bayes Criterion, TES = Tinnitus Evaluation System, VA = Department of Veterans Affairs, VHA = Veterans Health Administration.
Parameter Estimate p-Value Intercept -7.1227 0.07 Age 0.00831 0.90 PTA Low -0.0553 0.42 PTA High 0.0998 0.03 Low Frequency Loudness 0.1210 0.04 Match Sensation Level Median Pitch Match 0.000614 0.01 Note: PTA High = average of hearing thresholds at 3, 4, 6, and 8 kHz; PTA Low = average of hearing thresholds at 0.25, 0.5, 1, and 2 kHz.
The final selected model included the mean of the low frequency LM sensation levels and the median PM, along with the age and the low- and high-frequency PTAs.
where [n.sub.[i,j,k]] is the number of [p.sub.i] falling in the kth interval at the jth sensation level and [N.sub.[i,j]] is the total number of such physiological parameters belonging to the jth sensation level.
For example, there were ten mean skin temperature readings (i = 1 for [p.sub.1] to be [t.sub.sk]) belonging to the thermally neutral sensation level (i.e., j = 4) obtained in one file.
[FD.sub.[i,j,k]] = frequency distribution function to determine the probability of the parameter pi falling in the kth interval at the jth sensation level
[n.sub.[i,j,k]] = number of the parameter pi falling in the kth interval at the jth sensation level
[N.sub.[i,j]] = total number of the parameter [p.sub.i] belonging to the jth sensation level