In patients with confirmed STEMI, the geometric mean peak troponin I was 57.4 mcg/L
(95% CI, 48.0 to 68.6) in the oxygen group compared to 48.0 mcg/L (95% CI, 39.6 to 58.1) in the no oxygen group, with a ratio of oxygen to no oxygen of 1.20 (95% CI, 0.92 to 1.56;
P=0.18). Similar findings were obtained for AUC72 (Table 3). In the repeated measures analysis,
an approximate 20% difference in the geometric mean for cTnI was consistent across all assay
times (p-value for group*time interaction=0.93) (Fig. 2). The ratio for oxygen to no oxygen cTnI
based on the model that ignores the group*time interaction was highly significant, 1.28 (95% CI,
1.04 to 1.56; P=0.02)