Table 2.
Means and Correlations for Interactive Voice Response (IVR) and Timeline Followback (TLFB) Reports of Alcohol and Drug Use, Spending on Substances, and Sexual Practices (n = 36)
| Variable | TLFB M (SD) |
IVR M (SD) |
r | p < | Md | p |
|---|---|---|---|---|---|---|
| Drinking behavior | ||||||
| % days involving alcohol consumption | 15.9 (25.2) | 15.7 (21.9) | 0.76 | 0.0001 | 1.5 | ns |
| Quantity per drinking day (ml ethanol) a | 13.4 (30.2) | 13.7 (33.4) | 0.87 | 0.0001 | 1.5 | ns |
| % days involving expenditures on alcohol | 4.5 (8.6) | 11.3 (20.0) | 0.66 | 0.0001 | 5.5 | 0.027 |
| Money spent on alcohol ($) a | 0.39 (1.0) | 2.5 (6.2) | 0.86 | 0.0001 | 8.0 | 0.0009 |
| Illicit drug use b | ||||||
| % days involving drug use | 12.5 (22.6) | 12.5 (19.8) | 0.49 | 0.002 | 0 | ns |
| % days involving drug expenditures | 1.8 (3.7) | 6.5 (11.7) | 0.16 | ns | 4.0 | 0.096 |
| Money spent on drugs ($) a | 0.5 (1.1) | 1.1 (2.4) | 0.40 | 0.015 | 4.5 | 0.064 |
| Sexual behavior | ||||||
| % days involving sex | 19.4 (31.0) | 19.4 (25.1) | 0.67 | 0.0001 | 3.5 | ns |
| % days involving risky sex c | 14.9 (30.9) | 15.1 (24.9) | 0.66 | 0.0001 | 3 | ns |
Means based on days that involved any drinking (mean ml 190-proof ethanol consumed per drinking day) or expenditures on alcohol or illicit drugs (mean dollars spent on ethanol or illicit drugs per expenditure day).
Drugs included marijuana, crack cocaine, powder cocaine, prescription drugs not prescribed to participant (TLFB); marijuana, crack cocaine, powder cocaine, methamphetamine, prescription drugs not prescribed to participant, opiates, and club drugs (IVR).
Risky sex defined as sexual activity that also included one or more of the following: multiple or anonymous partners, substance use prior to or during sexual activity, unprotected sex, or exchange of money or other goods for a sex act (“transaction sex”).
Sign test for pairs of matched observations