Table 2. Statistical results of subgroup analysis.

Voxel size	Pooled sensitivity	I2 value (%)	Pooled specificity	I2 value (%)
≤0.2	0.73	0.0	0.68	72.7
>0.2, ≤0.3	0.60	82.7	0.79	43.2
>0.3, ≤0.4	0.64	28.1	0.69	61.5
>0.4, ≤0.5	0.83	71.2	1.000	0.0