Table 1.

Characterization of samples from human cocaine addicts and matched control group

Group	Percentage suicide	Age (years)	Gender (% male)	Brain weight (g)	pH	Refrigeration delay (h)
Control	32%	33.05 ± 3.193	95%	1508 ± 37.08	6.569 ± 0.062	5.934 ± 1.038
Cocaine dependent	80%	39.80 ± 2.153	95%	1434 ± 26.32	6.546 ± 0.072	8.850 ± 1.812
p value		0.11		0.18	0.48	0.016

The control group contains 19 individuals, and the cocaine-dependent group contains 20 individuals. All values are mean ± SE. p values calculated using two-tailed Student's t test.