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Estimated per cent changes (95% CIs) in heart rate variability parameters and heart rate associated with an IQR increase in exposure (13.4 μg/m3 for PM2.5 and 5.1 μg/m3 for SO42−) by inflammatory status (a) and by diabetes (b) (interaction models). *p<0.10, †p<0.05 for interaction effect.
