Table 5.

Intracranial, brain and cerebellar volumes (cm³) in control, bipolar without and with suicide attempts groups.³⁶

Variable	Control n=22	Bipolar disorder n=40	Bipolar disorder without history of suicide attempt (n=20)	Bipolar disorder with history of suicide attempt (n=20)	t / F	p
Intracranial volume*	1429.70±157.32	1399.37±153.19	1380.91±138.82	1417.82±167.87	0.55**, 0.55+	0.46**, 0.58+
Brain volume*	834.24±56.85	820.71±36.78	816.83±35.17	824.59±38.82	1.29**, 0.79+	0.26**, 0.46+
Left cerebellum*	44.31±7.51	40.18±6.03	40.85±5.53	39.50±6.57	5.58**, 2.97+	0.02**, 0.06+
Right cerebellum*	45.40±7.48	41.15±6.51	41.80±5.29	40.50±7.62	5.43**, 2.86+	0.02**, 0.06+
Vermis	5.62±0.81	4.76±0.66	4.97±0.71	4.56±0.55	20.20**, 12.19+	<0.01**,+

^*Mean±SD , cubic centimeters (cm³);

^**Controls versus bipolar (t-test, p value);

⁺Controls versus bipolar with and without suicide attempts (F test; p value).