Table 1:

Absolute 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 (aCBF)
Study	Mean aCBF	SD	Total (No.)	Mean aCBF	SD	Total (No.)	Weight	Mean Difference, IV, Random-Effects, 95% CI (aCBF)
Dangouloff-Ros et al, 2015²⁷	239	94.75	2	81.14	33.92	7	1.90%	157.86 (24.16–291.56)
Dangouloff-Ros et al, 2016¹⁷	80.12	47.31	65	31.6	10.39	52	24.20%	48.52 (36.68–60.36)
Hales et al, 2013²⁸	111.5	2.12	2	80.33	29.66	6	18.80%	31.17 (7.26–55.08)
Kikuchi et al, 2017³³	46.33	22.89	7	19.89	21.33	11	20.10%	26.44 (5.31–47.57)
Liu et al, 2015²⁹	53.52	17.4	6	47.32	14.74	6	21.50%	6.20 (−12.05–24.45)
Morana et al, 2017³⁰	0	0	0	0	0	0		Not estimable
Vidyasagar et al, 2016³¹	68.75	31.77	4	51.3	42.87	19	13.50%	17.45 (−19.17–54.07)
Yeom et al, 2014³²	0	0	0	0	0	0		Not estimable
Total (95% CI)			86			101	100%	29.62 (10.43–48.82)

Note:—IV indicates inverse variance.
↵a Heterogeneity: τ² = 360.34, χ² = 19.31, df = 5 (P = .002); I² = 46%; Test for overall effect: Z = 3.03 (P = .002).