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. 2008 Feb 27;116(7):970–975. doi: 10.1289/ehp.11076

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(A) Interaction between chronic stress and air pollution predicting IL-5 production. The graph displays the estimated regression line for the relationship between chronic stress and IL-5 production at low (−1 SD) and high (+1 SD) levels of air pollution. (B) Interaction between chronic stress and air pollution for total IgE. (C) Interaction between chronic stress and air pollution for eosinophil counts.