A night registration consisted of one mean LAeq value
per 30 s epoch noise recording for the inside and the outside
bedroom location. We performed correlation analyses for both
conditions (T.2307 and T.TIB) and the size of the correlations was
compared between the two timeframes using a Friedman ANOVA.
We refer to Field for the categorization of the size of the correlation
effects [19].
Additionally, we considered the location of the bedroom (street
or backside) as a mediating variable for the relation between inside
and outside noise levels. Firstly, Mann–Whitney U tests were used
to compare the noise levels (all noise indicators, inside and outside
levels) from the bedrooms located at the street versus the backside
of the house. Next, in order to investigate whether correlations differed
in strength depending of the bedroom location, they were
correspondingly subdivided and analysed with non-parametric
Wilcoxon Matched Pairs Tests, for all three noise indicators and
both timeframes.