Figure 3From: Long-term exposure to air pollution and hospital admissions for ischemic stroke. A register-based case-control study using modelled NOxas exposure proxy The distribution of the modelled NO x 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.Back to article page