Predictors of change in frequency of crack cocaine use in a street-recruited sample

Predictors of change in cocaine use in a street-recruited cohort of young cocaine users

AIM

To determine predictors of changes in amount of cocaine use among regular users outside treatment services.

DESIGN

Longitudinal study-we estimated the proportion of subjects who increased or decreased cocaine use and assessed possible predictors related to these changes among a street-recruited cohort of young regular cocaine users (RCU).

SETTING

Three Spanish cities: Barcelona, Madrid and Seville

PARTICIPANTS

A total of 720 RCU aged 18-30 years not regularly using heroin were recruited in the community during 2004-06 (Itinere Project). Follow-up interviews (n = 501) were carried out at 12-24 months.

MEASUREMENTS

The average amount of cocaine used weekly was calculated taking into account the number of days of use and the usual quantity (g/day). A multinomial logistic regression approach was used to investigate the association between changes in amount of cocaine use (i.e. difference exceeded 33.3% of baseline level) after 12-24 months, and baseline socio-demographic characteristics, nightlife, patterns of cocaine use and use of alcohol and other psychoactive drugs.

FINDINGS

Cocaine use baseline average level was 2.14 g/week [95% confidence interval (CI) = 2.02-2.42]. It decreased in 71.5% of subjects and increased in 14.1%. In multinomial analysis, negative associations were found between decreasing cocaine use and high levels of alcohol consumption and using an increasing number of psychoactive drugs. Moreover, low education level, having used cocaine frequently in houses and reporting cocaine binges were associated with increasing cocaine use.

CONCLUSIONS

A street-recruited cohort of cocaine users in Spain showed a significant reduction in cocaine use over a period of 12-24 months. High consumption of alcohol and increasing use of other psychoactive drugs decreased the probability of reducing cocaine use.

Longitudinal relationship between psychological distress and multiple substance use: results from a three-year multisite natural-history study of rural stimulant users

OBJECTIVE

Substance use is associated with poor mental health, but little is known regarding how use of multiple substances is associated with mental health, particularly longitudinally, in community studies. This article examines this issue in a large (N = 710), natural-history study of rural stimulant (cocaine and/or methamphetamine) users in three states.

METHOD

Respondent-driven sampling recruited recent (past-30-day) stimulant users in three counties each in Arkansas, Kentucky, and Ohio. Participants were interviewed every 6 months for 3 years. Mental health was measured by the Brief Symptom Inventory, and prior 6 months' substance use was measured for 17 possible substances. Data analysis used generalized estimating equations for longitudinal data with the Global Severity Index of the Brief Symptom Inventory as the dependent variable at each interview and substance use as predictor variables measured by number of substances used in the past 6 months and, separately, the 17 individual substances, adjusting for use of substance-use treatment, demographics, and recruitment site.

RESULTS

On average, both Global Severity Index score and use of many substances declined over the course of study. Global Severity Index score was significantly associated with (a) greater number of substances used in the past 6 months (p < .0001) and (b) use of crack cocaine, methamphetamine, and nonprescription use of prescription painkillers and tranquilizers.

CONCLUSIONS

Multiple and specific substances appear to incrementally increase psychological distress. Users of cocaine and methamphetamine are present in rural areas; these associations with poor psychological health raise concerns regarding availability of local treatment services for individuals with mental-health problems, as well as substance abuse.

Crack cocaine trajectories among users in a midwestern American city

AIMS

Although crack cocaine first appeared in cities in the United States in the mid-1980s, little is known about its use over long periods of time. This study identified crack cocaine user groups on the basis of long-term trajectories.

DESIGN

Following a natural history approach, data were collected periodically from 1996 to 2005. Group-based modeling assessed the probability of a crack smoker becoming abstinent during the observation period.

SETTING

A targeted sampling plan guided the recruitment of a community sample of crack cocaine users in Dayton, Ohio.

PARTICIPANTS

Crack smokers (n = 430) 18 years or older whose urine tested positive for cocaine metabolites at the baseline interview.

MEASUREMENTS

Interviewer-administered and audio computer self-administered, structured questionnaires were used to collect data on a range of variables, including frequency of crack use. Abstinence was defined as not having used crack for at least 6 consecutive months during the study.

FINDINGS

Three trajectory-based groups were identified: (1) No Change, characterized by a very low probability of abstinence; (2) Some Change, characterized by a low to moderate probability of abstinence; and (3) Dramatic Change, characterized by a high probability of abstinence. African Americans and men were significantly less likely to become abstinent. For the majority of the people (63.6%), crack use was uninterrupted by extended periods of abstinence during the study.

CONCLUSION

Crack cocaine use that persists for a decade or longer may well be the norm for a large proportion of people who have experience with the drug.

"Heavy users," "controlled users," and "quitters": understanding patterns of crack use among women in a midwestern city

Over the past two decades, the use of crack cocaine has become an enduring part of the social ecology of many cities across the United States. The purpose of this exploratory study is to describe patterns of crack use drawing on life history interviews conducted with 18 women in Dayton, Ohio, between 1998 and 2000. Ten of the women were African American, and eight were white. Age ranged between 23 and 47. The women were at very different stages of their crack-cocaine careers. We focus on understanding the social factors, life history, and everyday circumstances that participants related to their current patterns and levels of crack use. Implications for intervention are discussed.

Changes in use of crack cocaine after drug misuse treatment: 4-5 year follow-up results from the National Treatment Outcome Research Study (NTORS)

Crack cocaine outcomes at 4-5 years are reported for 496 drug users recruited from UK treatment programmes. About one-third used crack at intake and at 4-5 years. The results show different outcome profiles. For crack users at intake, use was more than halved at follow-up. Among non-crack-users at intake, about a quarter used crack during follow-up, of whom about two-thirds had never used crack before. Polydrug use and use of other stimulants were associated with using crack. Crack users reported worse acquisitive crime and psychological health outcomes. About 10% reported injecting crack. The reductions in crack use are encouraging, but the onset of crack use among many non-users at intake suggests the need to develop more effective treatment interventions.

Cocaine use and the utilisation of drug help services by consumers of the open drug scene in Hamburg

In order to describe the patterns of use in the open drug scene in Hamburg, a study was carried out among 616 drug users in the drug scene and in or in the vicinity of low-threshold institutions close to the drug scene in summer 2000. The special focus was on the prevalence of cocaine and crack use as well as on the utilisation of help services for drug users. 80% of the interviewed persons were male, the average age was 32.6 years. They had been using drugs such as heroin or cocaine for an average of 11 years. 84% had used heroin and 74% cocaine within the last 24 h. Use was intravenous for 66%. 57% used cocaine intravenously, the percentage of crack smokers was 22%. Compared to previous studies, an increase in cocaine use can be noted among the scene users in Hamburg, mainly related to intravenous cocaine use. Crack smoking has only increased slightly over the past few years. Based on cluster analysis, four consumption pattern groups can be established. The largest group (38%) mainly uses cocaine and heroin. The second group (26%) consists of polyvalent drug consumers using methadone in addition to heroin and cocaine, as well as, partially, benzodiazepines, cannabis or alcohol. Group 3 (19%) mainly uses heroin only, some of them also using methadone and/or cannabis. The fourth group (17%) is mainly related to alcohol, the greater part of them additionally using heroin. On the whole, it appears that those users who currently do not use cocaine (or crack) are in a better health and social situation. The group using only heroin (cluster 3) also compares favourably with the other three consumption pattern groups with regard to the intensity of use, consumption in public and risk behaviour. Almost all the interviewed persons are in contact with general practitioners. However, the increasing cocaine use has not been met by sufficient intervention and treatment programmes so far.