Meta-analytic methods for neuroimaging data explained

Table 1 Global gray matter volumes reported in seven studies on obsessive-compulsive disorder

	Reference	Patients		Controls		Patients + controls		Difference		Effect size
		Number	Volume ± SD	Number	Volume ± SD	N	Variance	Estimate	Variance	Estimate	Variance
Study 1	[46]	18	773 ± 56	18	822 ± 56	36	3,114	-49	346	-0.854	0.122
Study 2	[47]	55	685 ± 74	50	708 ± 72	105	5,323	-23	203	-0.313	0.039
Study 3	[48]	25	850 ± 83	25	834 ± 71	50	5,997	+16	480	0.196	0.080
Study 4	[49]	72	739 ± 82	72	763 ± 78	144	6,404	-24	178	-0.298	0.028
Study 5	[50]	37	776 ± 69	26	747 ± 68	63	4,680	+29	307	0.418	0.067
Study 6	[51]	19	827 ± 44	15	836 ± 63	34	3,041	-9	363	-0.179	0.120
Study 7	[52]	71	740 ± 66	71	738 ± 63	142	4,119	+2	116	0.035	0.028

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