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Airway responsiveness testing. EC200Raw (effective concentration inducing a 200% increase in airway resistance from baseline) across groups during airway challenge with histamine. * Significant decrease in EC200Raw compared to FA. Values are means ± SE. FA n = 24, HDMA n = 6, O3 n = 9, HDMA+O3 n = 7 (p = 0.05).
