Table 1. Demographic measures, genotypes and MA use measures.
| MA (N=53) | Control (N=47) | Test for group difference | |
|---|---|---|---|
| Demographic measures | |||
| Number of men/women | 31/22 | 25/22 | χ2(1) <1 |
| Years of age (M, s.d.) | 34.4 (9.4) | 32.1 (9.5) | t(98)=1.19 |
| Years of education (M, s.d.) | 12.7 (1.5) | 14.9 (2.2) | t(98)=5.80* |
| Ethnicity (number of participants) | |||
| Caucasian | 29 | 28 | |
| African American | 2 | 6 | |
| Hispanic/Latino | 15 | 5 | |
| Asian American | 2 | 5 | χ2(6)=10.65 |
| Native American | 0 | 1 | |
| Multiple | 1 | 0 | |
| Other | 4 | 2 | |
| SERT-LPR genotype (number of participants) | |||
| Short/short | 14 | 11 | |
| Short/long | 22 | 20 | χ2(2) <1 |
| Long/long | 17 | 16 | |
| SERT-VNTR Genotype (number of participants) | |||
| 9/9 | 0 | 0 | |
| 9/10 | 1 | 0 | |
| 9/12 | 2 | 0 | χ2(4)=3.25 |
| 10/10 | 9 | 6 | |
| 10/12 | 18 | 18 | |
| 12/12 | 23 | 23 | |
| MA use measures (M, s.d.) | |||
| Years of MA use | 11.0 (7.7) | ||
| Years of heavy MA use (3 × per week or 2-day binges) | 7.82 (7.0) | NA | NA |
| Days MA used per month | 20.8 (9.1) | ||
| Grams of MA used per week | 3.31 (4.29) | ||
Abbreviations: MA, methamphetamine; NA, not applicable; SERT-LPR, serotonin transporter-linked polymorphic region; SERT-VNTR, SERT-variable number tandem repeat polymorphism.
*P<0.05.