Table 1.
Prevalence (N=2,176) and factor loadings of measures contributing to the regular substance involvement (RSI) and peer substance involvement (PSI) factors in the Missouri Adolescent Female Twin Study (MOAFTS)
| % endorse | Factor loading | |||||
|---|---|---|---|---|---|---|
|
Regular substance involvement (RSI) | ||||||
| Regular alcohol use | 53.5 | 0.40 | ||||
| Regular cigarette smoking | 36.0 | 0.68 | ||||
| Repeated cannabis use | 18.1 | 0.65 | ||||
|
Peer substance involvement (PSI) | ||||||
| None | A Few | Some | Most | All | Factor Loading | |
| Smoked cigarettes regularly | 21.9 | 32.0 | 21.5 | 21.8 | 2.8 | 0.74 |
| Use smokeless tobacco | 59.1 | 27.3 | 11.3 | 2.1 | 0.2 | 0.47 |
| Drink alcoholic beverages regularly | 25.7 | 25.8 | 23.8 | 20.5 | 4.3 | 0.71 |
| Get drunk at least once a week | 38.1 | 27.6 | 19.9 | 12.2 | 2.1 | 0.75 |
| Smoke marijuana/hashish | 52.9 | 24.9 | 13.0 | 7.6 | 1.6 | 0.74 |
| Use crack cocaine | 89.0 | 8.9 | 1.5 | 0.3 | 0.2 | 0.56 |
| Use powder cocaine | 88.9 | 8.7 | 2.0 | 0.3 | 0.1 | 0.61 |
| Use heroin | 95.9 | 3.4 | 0.5 | 0.1 | 0.1 | 0.41 |
| Sniff glue, gas or sprays | 91.4 | 7.3 | 1.1 | 0.1 | 0.2 | 0.36 |
1st 3 Eigenvalues for RSI: 0.56, −0.05, −0.25; Proportion explained by 1st factor: 100%. 1st 3 Eigenvalues for PSI: 8.34, 3.07, 0.27; Proportion explained by 1st factor: 80%.