Table 4.

Mean and Weighted Mean Effect Sizes for Comparison of Cases with Bipolar versus Healthy Controls, the 95% Confidence Intervals (CIs), and Tests of Homogeneity (Q)

Domain	n studies	k effect sizes	M	Weighted M	Md	95% CI	z	Q
FSIQ	10	14	0.52	0.32	0.41	0.17–0.47	4.29	27.66a
Reading achievement	3	4	0.40	0.40	0.39	0.20–0.60	3.95	0.10
Attention	6	9	0.70	0.62	0.51	0.45–0.78	7.27	15.86a
Motor speed	4	7	0.37	0.33	0.34	0.09–0.58	2.71	8.21
Executive function	8	10	0.62	0.55	0.56	0.39–0.70	6.93	8.52b
Working memory	6	8	0.75	0.60	0.80	0.44–0.77	7.13	12.72b
Verbal fluency	2	2	0.38	0.45	—	0.05–0.85	2.22	—
Visual-perceptual skills	3	4	0.51	0.48	0.52	0.19–0.77	2.91	1.45
Visual memory	5	7	0.51	0.51	0.52	0.30–0.72	4.69	2.39
Verbal memory	6	8	0.88	0.77	0.78	0.59–0.94	8.70	11.33b

^ap < .05

^bp = .08