Table 1.
Items used in LCA Analysis
| Item | Scoring |
|---|---|
|
Symptom Count Items for Alcohol, Cannabis, Stimulant, Opiates, Sedatives (1) Did you ever need larger amounts of [substance] to get an effect or find that you could no longer get high on the amount you used to use? (2) Have you ever had such a strong desire for [substance] that it was hard to think of anything else? (3) Have you ever tried to stop or cut down on [substance] but found that you couldn’t? (4) Have you ever given up or greatly reduced important activities while using [substance] like sports, work, or associating with friends or relatives? (5) People who stop, cut down, or go without drugs after using drugs steadily for some time may not feel well. These feelings are more intense and can last longer than the usual hangover. When you stopped, cut down, or went without [substance] did you ever experience any of the following problems for most of the day for 2 days or longer? |
Summed criteria for each substance. Range (0–6) |
|
Number of Lifetime Use items for Cannabis, Stimulant, Opiates, Sedatives, Hallucinogens, and Other substances How many times in your life have you used [substance]? |
Total # of uses binned into 0, 0–10, 11–50, 51–99, >99 Range (0–5) |
| Dichotomous Items | |
| Alcohol Binge: Have you ever gone on binges or benders when you kept on drinking for 2 days or more without sobering up, except for sleeping? | Dichotomous |
| Have you ever used 2 or more drugs together? - Alcohol and Cannabis - Alcohol and Stimulants - Alcohol and Opiates - Alcohol and Sedatives - Cannabis and Stimulant - Cannabis and Opiates - Cannabis and Sedatives - Stimulants and Opiates - Stimulants and Sedatives - Opiates and Sedatives |
Dichotomous |
| Did you ever use alcohol to make yourself feel better when coming down from the effects of cocaine? | Dichotomous |
| Did you have any harmful effects from mixing alcohol and any drugs? | Dichotomous |
| Did using drugs cause you to have any other problems like an overdose? | Dichotomous |