Only the mean sound level during lairage (continuous variable, with a
minimum of 65 dB(A) and a maximum of 88 dB(A)) and prior to stunning
(class variable with 85 dB(A) as cut-off value) remain within the
proposed linear mixed model applying a P-value set at ≤0.06 for the
mean pH30LT, resulting in a final model that contains 93% of the observations.
Other sound level variables were excluded because they were insignificant
or did not show a trend in the final model (P N 0.06)
(Table 6)