Prognostic Values of the Gray-to-White Matter Ratio on Brain Computed Tomography Images for Neurological Outcomes after Cardiac Arrest: A Meta-Analysis

Table 3

Subgroup analysis.

		OR (95% CI)		( value)
Specificity
1	11	58.90 (24.40–142.22)	<0.001	0.0% (0.852)
Not 1	13	5.44 (3.33–8.88)	<0.001	60.5% (0.002)
Sample size
<100	15	12.08 (6.32–23.06)	<0.001	42.6% (0.041)
≥100	9	9.37 (3.55–24.74)	<0.001	83.4% (<0.001)
Study design
Retrospective	22	9.23 (5.31–16.06)	<0.001	65.8% (<0.001)
Prospective	2	57.46 (5.18–637.15)	0.001	59.7% (0.115)
Country
Asia	16	7.81 (4.15–14.68)	<0.001	65.7% (<0.001)
Non-Asia	8	18.26 (7.30–45.68)	<0.001	53.2% (0.037)
Cutoff
≤1.18	11	10.16 (4.00–25.76)	<0.001	73.6% (<0.001)
>1.18	12	11.72 (5.12–26.83)	<0.001	72.0% (<0.001)
Time of CT measurement
≤24 h	19	11.75 (5.84–23.66)	<0.001	75.8% (<0.001)
>24 h	5	10.25 (4.97–21.14)	<0.001	0% (0.555)
TTM
All	12	5.96 (3.18–11.16)	<0.001	66.0% (0.001)
Part	6	17.79 (4.56–69.39)	<0.001	72.0% (0.003)
None	2	22.63 (2.82–181.78)	<0.001	0.0% (0.547)
Cardiac etiology
≤50%	8	21.97 (10.86–44.46)	<0.001	0.0% (0.593)
>50%	9	4.51 (2.44–8.34)	<0.001	64.4% (0.004)
Row of CT
16 rows	4	11.66 (2.22–11.66)	0.004	61.6% (0.050)
64 rows	5	8.76 (3.65–21.01)	<0.001	6.1% (0.372)

CI: confidence interval; CT: computed tomography; OR: odds ratio; TTM: targeted temperature management.