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. 2009 Nov 18;118(3):324–330. doi: 10.1289/ehp.0901003

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Percent change (95% CI) in r-MSSD (msec; A) and HF (msec²; B) associated with different averaging times of O₃ and NO₂ exposure. MA, moving average. O₃ and NO₂ effects are scaled to their IQR.