Table 3. Subgroup analyses for studies investigating FA values in the intratumoral region.

Subgroup	No. of studies	SMD	95% CI	P value	I2
Study design
Prospective	3	0.38	0.01–0.75	0.042	3.5
Retrospective	4	0.04	−1.26–1.34	0.952	90.2
Type of gliomas
High-grade glioma	2	0.54	0.05–1.02	0.030	0
Glioblastoma	5	0.04	−0.88–0.95	0.940	87.6
Field strength (T)
3.0	3	0.78	0.24–1.32	0.005	55.6
1.5	4	−0.38	−1.13–0.37	0.316	69.4

Significant P values were shown in bold.