Figure 3.

The distribution of the modelled NOx concentrations in Scania. The mean NOx concentration for the cases was 12.9 μg/m3, with a standard deviation of 7.8, and for the controls 12.5 μg/m3, with a standard deviation of 8.0.

Oudin et al. BMC Public Health 2009 9:301   doi:10.1186/1471-2458-9-301
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