Table 1.
Demographic characteristics of study participants.
| Characteristics | Adolescent MA users (n = 44) | Healthy adolescents (n = 53) | P Value |
|---|---|---|---|
| Age — yr | 18.1±1.3 | 17.9±1.2 | 0.59 |
| Male sex — no. (%) | 35 (79.6) | 41 (77.4) | 0.80 |
| Education — yr | 10.8±1.7 | 11.4±1.1 | < 0.05 |
| IQ | 101.4 (8.5) | 110.0 (10.4) | < 0.001 |
| Right handedness — no. (%) | 38 (86.4) | 44 (83.0) | 0.65 |
| Race/ethnicity — no. (%) | |||
| East Asian | 44 (100) | 53 (100) | NA |
| SES — no. (%) | |||
| Low | 6 (13.6) | 7 (7.6) | 0.61 |
| Middle | 32 (72.7) | 42 (79.3) | |
| High | 6 (13.6) | 4 (13.2) | |
| Smoking — no. (%) | |||
| Current smoker | 34 (77.3) | 10 (18.9) | < 0.001 |
| Former smoker | 3 (6.8) | 0 (0.0) | |
| Never smoked | 7 (15.9) | 43 (81.1) | |
| FTND* | 1.86 (1.29) | 0.47 (1.20) | < 0.001 |
| Pack year history of smoking* | 1.17 (1.16) | 0.34 (0.80) | < 0.001 |
| Onset age of MA use — yr | 14.9 (1.1) | NA | NA |
Means and standard deviation values are denoted as mean ± standard deviation.
Continuous and categorical variables were compared between the groups using unpaired t-test and chi square tests, respectively.
*
There were no differences in FTND (mean ± SD, MA group, 2.38 ± 0.95, control group, 2.50 ± 1.65; t = −0.29, P = 0.78) and pack year history of smoking (mean ± SD, MA group, 1.46 ± 1.15, control group, 1.81 ± 0.87; t = 0.87, P = 0.39) of current smokers (n = 44) between adolescent MA users and healthy adolescents.
Abbreviations: yr, year; NA, not applicable; MA, methamphetamine; IQ, intelligence quotient; SES, socioeconomic status; FTND, Fagerstrom Test for Nicotine Dependence.