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Table 2 Correlation between tissue oxygen pressure and cerebral perfusion pressure below different cerebral perfusion pressure thresholds

From: Cerebral perfusion pressure and risk of brain hypoxia in severe head injury: a prospective observational study

   CPP < 50 mmHg CPP < 60 mmHg CPP < 70 mmHg CPP < 80 mmHg CPP < 90 mmHg CPP < 100 mmHg CPP < 130 mmHg
PtiO2 Spearman's Rho coefficienta 0.54 0.50 0.19 0.24 0.24 0.24 0.29
  Probability < 0.05 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01
  N samples 16 75 308 776 1,252 1,510 1,672
  1. aBilateral correlation. CPP, cerebral perfusion pressure; PtiO2, tissue oxygen pressure.