Table 3: Relationship of the arithmetic means, in dB (HL), of the tonal thresholds at the frequencies of 3, 4, and 6 kHz by exposure time to noise ().

Exposure time (month)Variable Mean SDMinimumMedianMaximum

≤60R_Mean3466527.887.16−3.336.7070.00
L_Mean3466529.258.63−5.008.30110.00

61–120R_Mean3464899.127.09−3.338.3050.00
L_Mean34648910.587.92−3.338.3353.33

121–180R_Mean34636111.417.80−3.3010.0063.33
L_Mean34636112.808.28−1.7011.6763.30

>180R_Mean34663818.0513.13−1.6715.0090.00
L_Mean34663819.7712.950.0016.6780.00

for the exposure range effect and side effect.