Table 1 Percent change (95 % CI) in risk of emergency room visits for myocardial infarction associated with Lag-0 PM_2.5 across strata of glutathione-related oxidative potential (OP^GSH) and combined redox-weighted oxidant capacity of NO₂ and O₃ (O_x ^wt)

≤50^th

−2.0 (−5.0, 1.0)

0.57 (−4.0, 5.0)

2.9 (−1.2, 7.2)

6.0 (0.0, 13)

>50^th

1.5 (−0.6, 3.6)

5.5 (3.0, 8.0)

6.4 (2.0, 11)

10 (7.5, 13)

>75^th

1.5 (−1.3, 4.4)

5.7 (2.5, 9.1)

6.7 (1.8, 12)

13 (6.8, 19)

>90^th

1.4 (−4.6, 7.8)

9.0 (3.5, 15)

9.2 (0.46, 19)

29 (26, 33)