Table 2 Correlation between socio-economic subgroups and mean annual exposure to NO₂ in Scania, Sweden (2001). The correlation coefficients for those born in OC (Other Country) and those with a low level of education are not presented since they are the exact inverse of the correlation coefficients for those born in Sweden, and those who are highly educated, respectively. The proportion with:"high level of education and concentration of NO₂" is calculated for the age-group 25–64 years.

Scania

Correlation coefficient

-0.9

0.2

p-value

<0.001

<0.001

All 5 cities together

Correlation coefficient

-0.5

-0.4

p-value

<0.001

<0.001

Malmö

Correlation coefficient

-0.8

0.1

p-value

<0.001

<0.001

Helsingborg

Correlation coefficient

0.1

0.2

p-value

<0.001

<0.001

Lund

Correlation coefficient

0.6

0.8

p-value

<0.001

<0.001

Kristianstad

Correlation coefficient

-0.3

0.2

p-value

<0.001

<0.001

Trelleborg

Correlation coefficient

0.1

0.5

p-value

<0.001

<0.001