Exposure to aircraft and road traffic noise and associations with heart disease and stroke in six European countries: a cross-sectional study

Table 3 Subsample analysis: Indicators of collinearity between noise and air pollution

Collinearity indicators^a	Daytime aircraft noise per 10 dB(A)	Night-time aircraft noise per 10 dB(A)	24 hr road traffic noise per 10 dB(A)
UK and Netherlands combined
Participants = 1411
Spearman’s ρ	0.06*	0.11**	0.51**
Correlation of estimated coefficients	0.11	0.06	−0.50
Variance Inflation Factor	1.00	1.01	1.32
Sweden
Participants = 990
Spearman’s ρ	0.16**	−0.35**	0.35**
Correlation of estimated coefficients	0.15	0.43	−0.31
Variance Inflation Factor	1.03	1.21	1.11

Correlations of Exposure Variables (Spearman’s ρ), Correlation of Estimated Coefficients of Exposure Variables, Variance Inflation Factor, in UK and Netherlands combined and Sweden separately.
*P < 0.05.
**P < 0.0001.
^aOnly the two exposures were considered, adjustment was not made for other covariates.

ISSN: 1476-069X