Extended Glasgow Outcome Scale correlates with bispectral index in traumatic brain injury patients who underwent craniotomy

Figures & data

Table 1 Subject characteristics

Characteristics	Value
Age (years), median (IQR)	24 (22)
Sex, n (%)
Male	56 (82.4)
Female	12 (17.6)
The degree of head injury, n (%)
Mild head injury	19 (27.9)
Moderate head injury	24 (35.3)
Severe head injury	25 (36.8)
The nature of head injury, n (%)
Epidural hematoma	13 (19.1)
Subdural hematoma	10 (14.7)
Intracerebral hematoma	22 (32.4)
Combinations	23 (33.8)
Comorbid disease upon admission, n (%)
Without comorbid disease	57 (83.8)
Diabetes mellitus	2 (2.9)
Hypertension	4 (5.9)
Diabetes and hypertension	5 (7.4)

Abbreviation: IQR, interquartile range.

Table 2 Spearman’s correlation analysis between BIS numbers and GCS score

Variables	Median (IQR)	r	P-value
GOS-E score	6.0 (7)	0.921	<0.01
BIS numbers	69.5 (27)

Abbreviations: BIS, bispectral index; GCS, Glasgow Coma Scale; GOS-E, Glasgow Outcome Scale-Extended; IQR, interquartile range.

Figure 1 Scatter plot distribution between GOS-E and BIS.

Abbreviations: BIS, bispectral index; GOS-E, Glasgow Outcome Scale-Extended.

Table 3 Linear regression analysis relationship between GOS-E and BIS

Variables	β	95% CI	P-value	R^2
BIS	0.192	0.174–0.211	<0.01	86.8%
Constant	-8.314

Abbreviations: BIS, bispectral index; GOS-E, Glasgow Outcome Scale-Extended.