. 2007 Mar 19;78(9):917–928. doi: 10.1136/jnnp.2006.100669

Table 4 Perception: weighted Cohen's d effect sizes* for each test, rank ordered by size.

	N studies	N participants	Mean Cohen's d_w	SD d_w(95% CI)	Min d	Max d	Nfs	%OL	Study references
VOSP position discrimination	2	57	−0.70	0.40 (−1.25, −0.14)	−1.34	0.00	5	57	28,109
VOSP dot counting	3	78	−0.68	0.54 (−1.29, −0.06)	−1.07	0.00	7	57	109,110,120
VOSP object decision	4	109	0.34	0.40 (−0.06, 0.73)	−0.75	0.99	3	79	78,109,110,120
VOSP cube analysis	4	98	−0.23	0.42 (−0.64, 0.17)	−0.61	0.52	1	85	109,110,119,120
VOSP incomplete letters	4	108	0.04	0.39 (−0.35, 0.43)	−0.83	0.47	0	100	78,109,110,119

Max d, maximum effect size; Mean d_w, mean weighted effect size; Min d, minimum effect size; N, number of studies contributing to the effect size; Nfs, fail safe N; SD d_w, SD of weighted effect size; %OL, per cent overlap between Alzheimer's disease and frontotemporal dementia groups; VOSP, Visual Object and Space Perception Battery; 95% CI, 95% CI for means.

*Effect sizes weighted by the inverse variance.