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Table 1 General and intracranial characteristics of patients and healthy volunteers.

From: Use of T2-weighted magnetic resonance imaging of the optic nerve sheath to detect raised intracranial pressure

Characteristics Brain-injured patients Healthy volunteers P value
Number of patients 38 36 -
Number of scans 45 36 -
Age (years) 35 ± 14 32 ± 8 0.37
Weight (kg) 86 ± 14 75 ± 10 0.0003
Sex (% male) 80% 75% 0.82
Overall ICU length of stay (days) 17 ± 9 - -
SAPS II score 21 ± 6 - -
Injury Severity Score (median [range]) 25 (9–50) - -
Glasgow Coma Score (median [range]) 7 (3–8) - -
Intracranial pressure (mmHg; [range]) 18.7 ± 5.6 (7–34) - -
Optic nerve sheath diameter (mm) 5.72 ± 0.71 5.08 ± 0.52 0.0001
Optic nerve diameter (mm) 2.65 ± 0.28 2.70 ± 0.23 0.26
Head CT scan (Marshall's category; % of patients)    
   DI category I 0% - -
   DI category II 55% - -
   DI category III 3% - -
   DI category IV 0% - -
   EML 39% - -
   NEML 3% - -
  1. Unless otherwise stated, values are expressed as mean ± standard deviation. DI, diffuse injury; EML, evacuated mass lesion; ICU, intensive care unit; NEML, nonevacuated mass lesion; SAPS, Simplified Acute Physiology Score.