Table 1.

Acoustic properties of noise events depending on traffic mode; each traffic mode category consists of N = 40 noise events

	AIR	ROAD	RAIL	P (Mann-Whitney-U test)
Variable	Mean (SD, Range)	Mean (SD, Range)	Mean (SD, Range)	AIR vs. ROAD	AIR vs. RAIL	ROAD vs. RAIL
SPL rise time [dB/s]	3.6 (1.1, 1.2 - 5.8)	6.3 (1.9, 3.1 – 13.6)	7.1 (2.6, 2.3 – 12.7)	< 0.0001	< 0.0001	0.0798
Noise duration [s]	66.0 (16.6, 36.8 – 109.5)	20.5 (7.2, 9.1 – 38.1)	25.9 (7.9, 14.0 – 46.4)	< 0.0001	< 0.0001	0.0030
Octave energy 31.5 Hz [dB]	44.6 (6.9, 34.4 – 63.4)	43.4 (6.2, 32.8 – 61.2)	62.5 (4.8, 52.9 – 70.1)	0.4914	< 0.0001	< 0.0001
Octave energy 63 Hz [dB]	47.8 (5.9, 37.9 – 60.4)	48.6 (8.4, 33.1 – 68.6)	59.9 (5.9, 43.2 – 71.0)	0.8549	< 0.0001	< 0.0001
Octave energy 125 Hz [dB]	45.4 (5.9, 35.9 – 63.3)	40.9 (9.7, 24.8 – 67.5)	52.3 (6.8, 36.6 – 66.8)	0.0084	< 0.0001	< 0.0001
Octave energy 250 Hz [dB]	46.1 (5.6, 37.7 – 62.6)	37.6 (6.8, 26.2 – 51.4)	51.1 (7.7, 36.7 – 64.6)	< 0.0001	0.0029	< 0.0001
Octave energy 500 Hz [dB]	46.0 (5.2, 37.9 – 56.6)	40.0 (7.0, 29.1 – 54.0)	47.1 (7.2, 33.1 – 61.4)	0.0002	0.4558	0.0001
Octave energy 1 kHz [dB]	41.8 (32.6, 32.4 – 52.7)	45.0 (5.8, 36.2 – 55.0)	42.0 (6.5, 28.5 – 54.9)	0.0289	0.8061	0.0377
Octave energy 2 kHz [dB]	32.6 (6.9, 21.3 – 45.1)	40.6 (6.3, 30.6 – 51.9)	39.4 (7.2, 25.9 – 53.9)	< 0.0001	0.0003	0.4052
Octave energy 4 kHz [dB]	18.1 (6.6, 9.5 – 30.6)	30.1 (5.5, 22.0 – 42.2)	32.6 (8.2, 18.3 – 46.1)	< 0.0001	< 0.0001	0.1019
Octave energy 8 kHz [dB]	11.4 (1.8, 7.9 – 15.5)	18.6 (5.8, 9.7 – 32.7)	18.1 (5.6, 11.6 – 37.0)	< 0.0001	< 0.0001	0.7508

SD refers to standard deviation; mid frequencies are given for octaves