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

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

Collinearity indicatorsa 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
  1. 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.
  2. *P < 0.05.
  3. **P < 0.0001.
  4. aOnly the two exposures were considered, adjustment was not made for other covariates.