Table 1.

Normality test for the continuous variables age, body mass index, stress score, and day–night noise level

Variable	Kolmogorov–Smirnov			Shapiro–Wilk
	Statistic	df	p-value	Statistic	df	p-value
Measured noise level	0.082	41	0.200	0.983	41	0.782
Modelled noise level	0.067	41	0.200	0.986	41	0.889