highly significantp = 0.000
The Welch’s ANOVA test applied on data with unequal variances (Levene’s test at α = 0.05) shows highly significant differences (F = 24.99; α = 0.001; p = 0.000) between the mean values of tested groups for data sets collected in the 5–7 July period, as well as significant differences but not highly significant (F = 9.81; α = 0.001; p = 0.002) between the tested groups for data sets collected in the 16–18 August period.