A History of Mild Traumatic Brain Injury Affects Peripheral Pulse Oximetry during Normobaric Hypoxia.

For pulse rate, differences between baseline and the last minute of each stress approached significance [ F (2.66,186.29) = 2.74, p = 0.052, η 2 = 0.038], and group pulse rate differences only emerged during the last minute of 14% O 2 and approached significances at 13% O 2 ; specifically 15.5% O 2 [ t (70) = 1.24, p = 0.218, d = 0.253], 14% O 2 [ t (70) = 2.17, p = 0.034, d = 0.511], and 13% O 2 [ t (70) = 1.81, p = 0.075, d = 0.362].

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Although the omnibus group by percent O 2 interaction failed to reach significance, univariate follow-up tests, using Greenhouse–Geisser correction to account for a significant Mauchly’s test of sphericity, showed that the non-significant MANOVA masked a single significant interaction for SpO 2 slope [ F (2.3,161.3) = 2.863, p < 0.001, η 2 = 0.569] (see Table 6 ).

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