Ozone and childhood respiratory disease in three US cities: evaluation of effect measure modification by neighborhood socioeconomic status using a Bayesian hierarchical approach.

Specifically, the parameter estimate for the cubic function of the NDI was nearly significant at the 0.05 level ( P = 0.052, 2-tailed) and the estimated mean ORs varied across NDI levels in a non-linear manner (Fig. 3 ).

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