Table 1 Number of study subjects in different noise exposure classes according to method of exposure assessment.

Noise exposure	Classified by dispersion model		Manually classified	Total
	National Road Administration	Sollentuna municipality
⩽45 dB(A)	0	0	125	125
45–50 dB(A)	0	0	120	120
50–55 dB(A)	96	0	209	305
55–60 dB(A)	20	25	47	92
60–65 dB(A)	2	9	12	23
>65 dB(A)	2	0	0	2
Total	120	34	513	667