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Table 2: Relative CBF in low- and high-grade tumors with associated results from meta-analysis of mean data^{^a}
Study High-Grade Tumors Low-Grade Tumors Weight Mean Difference, IV, Random-Effects 95% CI (rCBF)
Mean rCBF SD Total (No.) Mean rCBF SD Total (No.)
Dangouloff-Ros et al, (2015)²⁷ 3.4 0.99 2 0.9 0.26 7 7.10% 2.50 (1.11–3.89)
Dangouloff-Ros et al, (2016)¹⁷ 1.74 1.45 65 0.68 0.24 52 37.50% 1.06 (0.70–1.42)
Hales et al, (2013)²⁸ 0 0 0 0 0 0 Not estimable
Kikuchi et al, (2017)³³ 1.76 0.95 7 0.69 0.81 11 15.40% 1.07 (0.22–1.92)
Liu et al, (2015)²⁹ 0 0 0 0 0 0 Not estimable
Morana et al, (2017)³⁰ 2.08 0.98 14 0.81 0.56 12 23.90% 1.27 (0.67–1.87)
Yeom et al, (2014)³² 2.98 1.9 21 1.12 0.36 32 16.20% 1.86 (1.04–2.68)
Total (95% CI) 109 114 100% 1.34 (0.95–1.74)
Note:—IV indicates inverse variance.
↵a Heterogeneity: τ² = 0.13, χ² = 9.28, df = 5 (P = .10); I² = 46%; Test for overall effect: Z = 5.94 (P < .00001).