Table 4 Univariate logistic regressions.

From: Brain hypoxia and metabolic crisis are common in patients with acute brain injury despite a normal intracranial pressure

Explanatory variable

SAH

TBI

Overall

OR (95% CI)

P-value

OR (95% CI)

P-value

OR (95% CI)

P-value

ICP > 20 mmHg (%)

1.10 (1.00–1.39)

0.202

0.90 (0.71–1.12)

0.337

1.06 (0.99–1.19)

0.221

CPP < 60 mmHg (%)

1.11 (0.98–1.38)

0.248

0.90 (0.75–1.02)

0.134

1.00 (0.94–1.08)

0.955

PbtO2 < 20 mmHg (%)

1.03 (1.00–1.06)

0.054

1.01 (0.98–1.04)

0.499

1.02 (1.00–1.04)

0.041

Metabolic crisis (%)

1.00 (0.97–1.02)

0.781

0.99 (0.97–1.02)

0.527

0.99 (0.98–1.01)

0.520

  1. Univariate logistic regressions of the relationship between functional outcome and each individual neuromonitoring variable (summarised as the percentage of total monitoring time spent with abnormal values). The OR can be interpreted as an increase in the odds of an unfavourable outcome (i.e., a modified Rankin Scale of 3–6) with each percent increase in the time spent with an abnormal value of the explanatory variable. CI Confidence interval, CPP Cerebral perfusion pressure, ICP Intracranial pressure, OR Odds ratio, PbtO2 Brain tissue oxygen tension, SAH Subarachnoid haemorrhage, TBI Traumatic brain injury.
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