For several othe rmarkers we observed
significant negative associations with long-term exposure to NOx in the
Italian cohort, but not in the Swedish or combined cohorts: IL-2 (q =
0.012), TNF-α (q = 0.020), IL-10 (q = 0.017). For IL-10 the nonsignificant
association observed in the combined cohorts was in the
same direction as it was in the Italian cohort (q 0.083).