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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.