Table 3.
Bivariate correlation analysis between cFTOE and crSaO2 with IR, TAM, tcSaO2 and tcSaO2_FiO2.
| Average crSaO2 | cFTOE | |
|---|---|---|
| Variables | Correlation Coefficient ρ [95% CI] | Correlation Coefficient ρ [95% CI] |
| IR | −0.06 [−0.35, 0.25] | 0.04 [−0.26, 0.36] |
| MAP | ||
| Day 1 | 0.40 [0.15, 0.61] * | −0.40 [−0.61, −0.14] * |
| Day 2 | 0.34 [0.07, 0.56] * | −0.33 [−0.53, −0.08] * |
| Day 3 | 0.41 [0.16, 0.63] * | −0.39 [−0.62, −0.15] * |
| Day 4 (a) | 0.44 [0.15, 0.69] * | −0.41 [−0.65, −0.14] * |
| SatO2 | ||
| Day 1 | 0.10 [−0.15, 0.33] | −0.05 [−0.28, 0.21] |
| Day 2 | 0.05 [−0.25, 0.32] | 0.01 [−0.26, 0.28] |
| Day 3 | 0.32 [0.01, 0.59] * | −0.28 [−0.54, 0.04] |
| Day 4 | 0.03 [−0.31, 0.34] | 0.0001 [−0.31, 0.31] |
| SatO2_FiO2 | ||
| Day 1 (b) | 0.04 [−0.23, 0.31] | −0.02 [−0.29, 0.29] |
| Day 2 | 0.17 [−0.11, 0.43] | −0.15 [−0.41, 0.14] |
| Day 3 | 0.23 [−0.07, 0.50] | −0.23 [−0.47, 0.04] |
| Day 4 (c) | 0.21 [−0.12, 0.48] | −0.21 [−0.48, 0.09] |
crSaO2: cerebral regional oxygen saturation; cFTOE: cerebral fractional tissue oxygen extraction; (a) complete case data n = 41; (b) complete case data n = 47; (c) complete case data n = 43; 95% CI = 95% the confidence interval for Spearman’s rank correlation coefficient was calculated using the percentile method based on 1000 bootstrapped samples with replacement; * significant level: p < 0.05