## 3 Results and Discussion
### Acoustic Variables Associated with Maximum or Minimum Values of Sound Energy
In the case of some of the effects analysed, they are even better in terms of explaining the variability (b, c) or are equivalent (f) to the average energy indicators; this may be an unexpected result, and to the best of the authors' knowledge, has not been reported previously. The result for effect (c) is particularly remarkable, with a significant increase in the value of the correlation coefficient with respect to that obtained with the average sound energy indicators. From an overall analysis of this type of indicator in terms of frequency and time weightings, it can be seen that the indicators of minimum values that take into account low frequencies (C weighting) can explain a higher proportion of the variability than those with an A weighting. It should be noted that, so far, the relevance of a low frequency was clear for only three of the effects. For the minimum energy sound indicators, it seems that for all the effects, the C weighting gives better results than the A weighting. These results may indicate that, for some of the effects studied here, both the average and minimum energies may help to explain the appearance or importance of an effect. Similar behaviour is observed for all in the case of time weightings, although an F weighting achieves the best results. It should be pointed out that for some effects, and mainly those associated with conversation, the I weighting differs more significantly from the F weighting. Finally, it should be noted that, unlike the indicators in the previous section, the least amount of explanation of variability is obtained for annoyance (i). It therefore appears that this effect is most specifically related to the average energy. As is shown in the previous section, this may be the reason why the indicators currently used to measure the effects of environmental noise are mainly based on average energy values. In addition, the results for the A weighting for this effect justify the continued use of this weighting to some extent, even though it is not optimal for other effects, according to the results found in this research. From Table S1 of the Supplementary Materials, it can be seen that all subjective variables are correlated with the indicators associated with the maximum or minimum values of sound energy, with slope values ranging between 0.07 and 0.29. However, the highest slope values are seen for the indicators of the minimum sound levels. In general, a variation in these minimum energy indicators of between 3.5 and 5 dB corresponds to a variation of approximately one point on the 0-10 rating scale for all subjective variables. Acoustic Variables Associated with Sound Energy in Different Parts of the Audible Spectrum 3.3.1. Variables Related to Specific Parts of the Audible Spectrum  
This third section shows the results of an analysis of the capacity of the acoustic variables representing the sound energy over the whole period of measurement to explain \begin{table}
\begin{tabular}{c c c c c c c} \hline  & \(L_{ASmin}\) & \(L_{AFmin}\) & \(L_{AAmin}\) & \(L_{CSmin}\) & \(L_{CFmin}\) & \(L_{CInin}\) \\ \hline (a) & 0.56 ** & 0.59 *** & 0.56 ** & 0.66 *** & 0.66 *** & 0.66 *** \\ (b) & 0.66 *** & 0.69 *** & 0.66 *** & 0.71 *** & 0.72 *** & 0.70 *** \\ (c) & 0.66 *** & 0.69 *** & 0.66 *** & 0.69 *** & 0.70 *** & 0.66 *** \\ (d) & 0.55 ** & 0.57 ** & 0.55 ** & 0.60 *** & 0.61 ** & 0.60 *** \\ (e) & 0.56 ** & 0.54 ** & 0.56 ** & 0.57 ** & 0.58 ** & 0.55 ** \\ (f) & 0.52 ** & 0.54 ** & 0.52 ** & 0.52 ** & 0.55 ** & 0.51 ** \\ (g) & 0.53 ** & 0.53 ** & 0.52 ** & 0.52 ** & 0.54 ** & 0.49 ** \\ (h) & 0.57 ** & 0.60 ** & 0.58 *** & 0.66 ** & 0.66 *** & 0.65 ** \\ (i) & 0.46 * & 0.45 * & 0.46 * & 0.49 ** & 0.50 ** & 0.49 ** \\ \hline \end{tabular}  
* Significant at \(p\leq 0.05\). ** Significant at \(p\leq 0.001\).  
\end{table} 
Table 5: Correlation coefficients between subjective variables and acoustic variables related to the minimum values of the sound energy.