Figure 5
From: Cardiac effects of seasonal ambient particulate matter and ozone co-exposure in rats
Mean change in QTc interval from pre-exposure values during summer and winter exposures. QTc values for each animal at each time point during exposure or after exposure were subtracted from corresponding time-matched pre-exposure baseline data, which was recorded while the animals were either in the chamber (for “during exposure” data) or in their home cages (for “after exposure” data). Values represent mean change in QTc interval in msec ± standard error of the mean (n = 6). b - significantly greater than filtered air control (p < 0.05).