Table 1.

Demographic factors and drug use history for comparison (n = 15) and METH-dependent (n = 15) subjects. PPVT results are presented as age-adjusted standard scores. The PANSS total score ranges from 30 to 210, and the Positive and Negative symptoms subscales range from 7 to 49. Higher scores indicate more severe psychopathology.

Parameter	Comparison	METH-Dependent	Difference
Age (years)	37.8 ± 2.5	36.9 ± 2.2	ns
Gender	11 M, 4 F	12 M, 3 F	ns
Education (years)	14.1 ± 0.6	13.6 ± 0.6	ns
Ethnicity (n)			ns
Caucasian	11	11
Latino	2	3
African-American	2	1
Peabody Picture Vocabulary Test scores	100.9 ± 3.2	97.6 ± 2.3	ns
Age at first METH use (years)	----------	22.1 ± 2.0
Duration of continuous METH use (years)	----------	10.6 ± 1.7
Frequency of METH use (per month)	----------	23.4 ± 2.5
Total amount of METH used (in grams)	----------	6390.1 ± 1378.6
Number of days METH used in past year	----------	54.5 ± 24.2
Duration of METH Abstinence (Days)	----------	259.7 ± 57.4
PANSS Total Score	33.6 ± 0.8	43.2 ± 1.7***
PANSS Positive Symptoms	8.1 ± 0.3	12.3 ± 1.0***
PANSS Negative Symptoms	7.7 ± 0.3	7.5 ± 0.2

Data are represented as means ± S.E.M. Asterisks indicate significant group differences

^***p < 0.001.