Research | Open | Published:
Psychosocial problems among individuals with substance use disorders in drug rehabilitation centers, Nepal
Substance Abuse Treatment, Prevention, and Policyvolume 11, Article number: 28 (2016)
Substance use is associated with numerous undesirable short and long term consequences. The individual not only suffer from physical and psychological problems but also loses the ability to interact with family, peers and society. The present study aims to identify the psychosocial problems and associated factors among individuals with substance use disorders.
The study was conducted using descriptive cross sectional research design in different drug rehabilitation centers of Nepal. Probability proportional to size sampling technique was used to select the drug rehabilitation centers and individuals diagnosed with substance use disorder but free from any substance withdrawal features, admitted in rehabilitation centers within 3 months and clients above 15 years of age were included in the study (N = 204). A standard tool Drug Use Screening Inventory-Revised was used to assess the psychosocial problems and the scores ranged from 0 to 100. The data were analyzed using descriptive and inferential statistics. Linear regression analysis was conducted to identify the predictors of psychosocial problems.
The mean and standard deviation of overall psychosocial problems scores was 60.42 ± 19.44. Among different domains, more problems were found in substance use domain (75.00 ± 21.43) followed by school performance (64.60 ± 25.53), behavior pattern (64.53 ± 24.44), peer relationship (64.49 ± 24.91), social competence (61.30 ± 22.60), psychiatric disorder (56.83 ± 23.39), family system (48.28 ± 23.72) and work adjustment (45.90 ± 29.88) domains. Types of substance use, mode of substance use and age of initiation of substance use were the significant predictors of overall and most of the domains of psychosocial problems.
Substance use poses significant impact on individual’s psychological and social wellbeing. Individuals using injecting drugs, initiating substances early in life, using substances many times in a day and using both licit and illicit substances had more psychosocial problems. Hence, treatment centers should take this into account.
The problem of substance abuse is an old phenomenon in the present day world. People have been using various kinds of psychotropic substances not only as a means of coping with various problems of life but also to derive pleasure out of it and to facilitate religious and ritualistic aims. It leads to addiction and has been associated with wide range of psychosocial problems.
World Health Organization estimates, the global burden of disease attributable to alcohol and illicit drug use is 5.4 %. The point prevalence of alcohol use disorders (in the population aged 15 years and over) is generally higher than the point prevalence of drug use disorders in the same population and is generally higher among men than among women . World Drug Report 2013 also estimates that in 2011, between 167 and 315 million people aged 15–64 have used an illicit substance in the preceding year .
The estimated prevalence of alcohol use disorders and drug use disorders in Nepal for female is 0.48 % and 0.02 % respectively, and for male is 3.80 % and 0.15 % respectively . A nationwide survey on current hard drug users in Nepal showed that there are altogether 91,534 current drug users in 2013 which is nearly double of 46,309 in 2007 .
Substance use is generally initiated in adolescence or early adulthood and is commonly associated with variety of problems [5–7]. These problems can be in any area of the client’s functioning: physical, psychological, family, interpersonal, social, academic, occupational, legal or spiritual. They can lead to physical and psychological dependence, coercing the person to continue taking the drug despite adverse consequences. Besides profound impairment and loss of physical health, people with alcohol and drug use disorders may suffer severely from psychosocial problems, interpersonal problems, loss of employment, difficulty in participating in education, and legal problems . An extensive body of research has also demonstrated high rates of psychological impairment and reduced quality of life among the individuals with substance use disorders (SUDs) [8–10]. It has been stated that by the year 2020 mental and SUDs will surpass all physical diseases as a major cause of disability worldwide .
Social harms associated with psychoactive substance use include interpersonal problems that impact adversely on relationships with family members, friends, colleagues and members of society . Likewise, heavy drinking can lead to a decline in the overall academic performance [12, 13]. It has been reported that about a quarter of college students experience difficulty with academics due to alcohol use, including earning low grades, doing poorly on tests and papers, missing class, and falling behind. Even students who do not abuse alcohol may suffer academically as a result of their peers’ drinking .
Literatures have demonstrated the relationship of age of initiation of substance use to the psychosocial problems. Individuals who engage in substance use early are more likely to develop harmful patterns of use, suffer from severe psychological problems, adjustment problems and school dropout [15–17]. Similarly, previous studies have identified age [18–20], gender [8, 18, 21–25], types of substance use [26–28], frequency of substance use [25, 26] and mode of substance use [9, 29] as the important variables associated with the psychosocial problems among the individuals with SUDs.
SUDs are typically long-lasting, persistent, challenging to treat and have tendency to relapse after remission. Psychosocial distress also could increase the probability of more substance use among patients with SUDs . Therefore, it is worthwhile to identify psychosocial problems among the individuals with SUDs so that unique problems of those patients could be identified early and necessary intervention could be done to prevent the development of relapse and improve the patient's quality of life. Hence, the negative and long-term impact of a drug using lifestyle on various life domains urges for a shift of focus in such type of research. The purpose of the present study is to
identify the psychosocial problems among the individuals with SUDs in various domains.
assess the association of socio-demographic and substance use related characteristics with psychosocial problem domains.
identify the predictors of psychosocial problems.
A descriptive cross sectional research design was used to assess the psychosocial problems among the individuals with SUDs. Probability Proportional to Size (PPS) sampling technique was used to select the drug rehabilitation centers of Nepal. According to Central Bureau of Statistics Nepal, 2013 there are 22 rehabilitation centers operating in Kathmandu. At first, the list of the rehabilitation centers and number of clients residing in those centers were obtained. The number of individuals meeting the inclusion criteria in those centers ranged from 3 to 50. Eight centers were excluded as five centers did not give permission to conduct the study whereas three centers had very few clients (less than 5) who meet the inclusion criteria. One center was assigned for pretesting of the questionnaire. Based on the feasibility of the study, among those 13 centers, 6 centers (50 % of the total rehabilitation centers) were selected by using PPS sampling technique. Since respondents in some centers were few in numbers, further sampling technique at client level was not performed. All the respondents of the selected centers who met the inclusion criteria were included in the study and comprised of 204 individuals with SUDs.
All the centers had visiting psychiatrist and provide treatment for an average of 3 months. Centers were run by trained or experienced counselors and offered services for both licit and illicit substance users including alcohol users. However, only one center offered services for female substance users whereas other five centers enrolled treatment seeking male substance users. The study population was the diagnosed clients with SUDs, who were above 15 years of age and free from any substance withdrawal delirium or ongoing psychotic symptoms. Respondents admitted in treatment centers for more than 3 months were excluded from the study to reduce recall bias. The diagnosis of the SUDs was done by the psychiatrists present in those centers. In this study, the word injecting drug user refers to those respondents who uses only injecting drugs and both injecting as well as non injecting substances.
Data collection procedure
Data were collected by using Nepali version, pre-tested self administered questionnaire. Questions regarding socio-demographic characteristics and pattern of substance use were developed after extensive literature review. Psychosocial problems of individuals with SUDs were assessed by using a standard tool Drug Use Screening Inventory-Revised (DUSI-R) , which was developed by Dr. Ralph Tarter in 1990. In this study psychosocial problems are the problems faced by individuals with SUDs in relation to different domains of DUSI-R. The decision to use this tool was based on its focus on the assessment of the psychosocial problems among the individuals with SUDs and established psychometric properties.
DUSI-R, a self-report questionnaire, quantifies severity of problems in 10 domains: 1) Substance Use, 2) Health Status, 3) Behavior Pattern, 4) Psychiatric Disorder, 5) School Performance, 6) Family System, 7) Work Adjustment, 8) Peer Relationships, 9) Social Competence, and, 10) Leisure/recreation. Based on the study objectives, only eight domain of DUSI-R (excluding Health Status and Leisure/Recreation domain) were included in the study. The questionnaire collects the information with reference to past 1 year. The tool is copyright so permission for the use of the instrument and inclusion of only eight domains in the study was taken from the owner.
Validity and reliability of the DUSI-R have been documented [24, 31]. For the use of the tool in Nepalese context, first forward translation (from English to Nepali) then backward translation (Nepali to English) was done. Finally, the back translated text was compared with the original text and differences between these two texts were resolved through discussion between translators for ensuring semantic equivalence. The back translated tool was also sent to the original developer of the tool for verification. To identify the accuracy, adequacy and completeness of the tool, pre testing of the translated instrument was done on fifteen respondents of one of the drug rehabilitation center. On the basis of pretesting, necessary modification were made in part I and II of the instrument. Cronbach’s alpha coefficient was computed to determine the reliability of translated (Nepali version) DUSI-R and was 0.924 which showed a high degree of internal consistency among 127 items. The alpha coefficient of different domain was as follows: Substance use = 0.79, Behavior patterns = 0.84, Psychiatric disorder = 0.84, Social competence = 0.73, School performance = 0.81, Work adjustment = 0.78, Family system = 0.76, Peer relationship = 0.81.
For each domain and overall psychosocial problem, the raw score was transformed into a scale from 0 (lower) to 100 (higher). Problems in each domain, and the overall psychosocial problem density index, were determined in standard manner using the formula provided by the tool. The school performance domain was used only by those respondents who used to go to school within the past 1 year. Similarly work adjustment domain was used by those respondents who were engaged in any form of work within the past 1 year. So, for the calculation of overall problem density index in those respondents who do not have to answer the questions regarding that domain, the denominator was adjusted.
Data were analyzed using Statistical Package for Social Science 20 (SPSS 20). Data were interpretative as higher the score higher the psychosocial problems. As the normality test of the data revealed normal distribution of the data, parametric tests were used for the analysis. In descriptive statistics frequency, percentage, mean, range and standard deviation (SD) were used where as in inferential statistics to assess the association between different variables and psychosocial problems, t-test and one-way analysis of variance (one-way ANOVA test) was used. In all the inferential statistical procedures, p value of 0.05 or less (p ≤ 0.05) was considered statistically significant.
Furthermore, backward multiple linear regression model was constructed to identify the predictors of each psychosocial problem domain. For each psychosocial (DUSI-R) domain the initial model included all the variables that were found to be significantly related in the univariate analysis. Variables entered the model with α ≤ 0.05, and they were removed with α > 0.10. R 2 was estimated for the final models to determine the amount of variance in each domain of the psychosocial problem score explained by the predictor variables.
Characteristics of the respondents
Psychosocial Problem Scores of DUSI-R
The mean and standard deviation of overall psychosocial problem scores of the respondents was 60.42 ± 19.44. Among eight domains, highest score was found in substance use domain i.e. 75.00 followed by school performance 64.60, behavior pattern 64.53, peer relationship 64.49, social competence 61.30, psychiatric disorder 56.83, family system 48.28 and work adjustment 45.90 (Table 3).
Association between respondent's characteristics and DUSI-R domains
In this study, significant statistical association was observed between age and all the domain of DUSI-R except social competence and school performance domain. Regarding sex, though females had higher scores on the overall and all the domains of DUSI-R, significant association was found only with psychiatric disorder domain. Education was significantly associated with only family system domain. Regarding occupation of the respondents, economically inactive group obtained significantly higher score on overall and most of the domains except substance use and school performance domains (Table 4).
Respondents who had initiated substance use before 20 years, both licit and illicit substance user and injecting drug user had significantly higher problems on overall and all the domains of DUSI-R except school performance domain. Moreover, the respondents who took substances more than or equal to 3 times/day had significantly higher score on overall problem and most of the domains except on family system domain than respondents who took substances less than 3 times per day (Table 5).
Multivariate analysis of predictors of different domains of DUSI-R
Individuals using substances more frequently and injecting drug users had higher probability of problem in substance use domains whereas this probability was lower in licit substance user. Behavior problem domain was positively associated with injecting drug users whereas negatively associated with age of initiation of substance use and licit substance user. Similarly, higher problem in psychiatric disorder domain was observed with injecting mode and early initiation of substance use. Licit substance user and male had significantly lower problem in psychiatric disorder domain. Social competence domain was also positively associated with injecting mode of substance use and negatively associated with licit substance user. Individuals with higher educational level and licit substance user had greater probability of having lower problem in family system domain. It was evident that none of the variables were the significant predictors of the school performance domain. Regarding work performance and peer relationship domain, injecting substance user had higher work adjustment and peer relationship problem whereas licit substance user had lower problem related to those domain. Furthermore, early age of initiation of substance use was negatively associated with work adjustment domain. Similarly, licit type of substance use, injecting mode and age of initiation of substance use were the important predictors of overall psychosocial problem score (Table 6).
In this study, the mean overall psychosocial problem score of individuals with SUDs was 60.42 which was greater than the mean score (43.08) obtained in the study conducted among Turkish male adolescence . Both the study highlighted higher problems in substance use and peer relationship domains while less in work adjustment domain though the score were inconsistent. The findings of this study also revealed that substance use affects not only on the individuals interpersonal relationship but also on behavioral, emotional and academic performance which was also supported by studies conducted in Brazil, Pakistan and New Zealand [6, 7, 32]. However, the other study reported that the level of school achievement of adolescents with SUDs is neither significantly lower nor the prevalence of learning disabilities higher, when compared to adolescents without SUDs .
Moreover, significant differences existed among the respondents of different age group in overall problem score and different domains except social competence and school performance domains. Compared to other age group, respondents below 20 years had higher score on overall and all the domains except substance use domain. This finding reveals that adolescent substance users have more psychosocial problems than adult substance abusers. Contrary to this finding, the other study revealed higher psychosocial problems in young adult followed by mid adult and lesser in 12–18 years youth . Similarly, study conducted in Nepal reported that, among the patients with SUDs, majority had depression and were adult and older group than adolescence . This is probably because; these two studies were conducted in community and hospital setting respectively whereas the current study was done in rehabilitation centers.
Regarding sex, females had higher score on the overall psychosocial problem score and all the domains of DUSI-R. However, significant association was found only on psychiatric disorder domain. The result of this variable might have been influenced by few numbers of female respondents in this study. Various studies examining overall rates of psychiatric co-morbidity found that women substance users have more psychological problems than men [8, 21]. The findings were also supported by the study done among individuals admitted for substance use treatment in Manitoba, Canada which showed that female had significantly severe disturbance on overall and all the domain of DUSI-R except work adjustment domain . Contrary to this study finding, the other study revealed higher problems among substance use disorder male than female in overall and almost all domain of DUSI-R, however significant difference were observed only on overall problem, substance use, work adjustment and peer relationship domain .
In this study education was significantly associated with only family system domain. Regarding occupation, economically inactive respondents obtained significantly higher score in the overall and all the domains except substance use and school performance domain. Here, work capacity, financial independence and less free time might be the possible factors contributing to the lower psychosocial problem among economically active group. Similarly, as unemployed have to depend on others for money to buy substances, they try to engage in some work but fail to continue it so that they might have more psychiatric, behavioral, peer relationship, family system and work adjustment problems. Similar finding was reported in the study conducted in Nepal, where the majority of the unemployed substance users had depression than employed substance users .
Regarding age of initiation, the respondents who had initiated substance use before 20 years had significantly higher problems on overall and all the domains except school performance domain than those respondents who initiated substance use at 20 years or after that. Though not significant on school performance domain the problem was higher in same group. This finding is supported by the study conducted in Virginia which showed that early drinking is strongly related with severity of substance use problems and reduced engagement in social activities including work and school problems . The other studies conducted in New Zealand and UK also supported the findings [12, 13, 34, 35].
The variable like types of substance use had significant influence on overall problem and different domains except school performance domain. The study findings revealed that respondents who use both licit and illicit substances had higher score on overall and almost all domains whereas licit substance users (only alcohol users) had lower score on overall problem as well as all the domains than other two groups. The study conducted in Norway also supported the current study findings which revealed that psychosocial symptoms load was higher in the groups with high consumption level of illicit substances compared to those who mainly had high consumption levels of alcohol . However, contradictory to the above findings, study done in UK did not find any significant differences between alcohol dependent clients and drug and alcohol dependent clients on the measure of quality of life at different domains .
The frequency of the substance use was found to be significantly associated with the overall problem and different domains expect family system domain. Respondents who took substances more than or equal to 3 times/day obtained higher score on overall problem and all the domains. This findings has been supported by other study which showed that individuals who reported using cannabis more than 10 times in the past year were at greater risk of substance use problem and were more likely to drop out of school and be unemployed than those who used less than 10 times .
Similarly, compared to non-injecting substance users, injecting substance users had significantly higher score on overall as well as all the domain of DUSI-R except for school performance domain. The study conducted in Nepal also supported the findings which revealed that all the patients using intravenous drug had depression whereas only 66 % of the non injecting substance users had depression . Likewise, the other study conducted among hidden homeless injecting drug users in a Canadian community also showed that compared to non injecting substance users, injecting drug users had more family and social relationship problems, less social support and more behavioral problems .
Though many variables were identified as the associated factors of psychosocial problem domains, further linear regression analysis revealed mode and type of substance use as the important predictors of overall and most of the domains (substance use, behavior pattern, psychiatric disorder, social competence, work adjustment and peer relationship) of DUSI-R. Injecting drug users had higher problems compared to non-injecting substance users and licit substance user had significantly lower problems compared to both (licit and illicit) type of substance user. The present study also suggested frequency of substance use as positive predictor of SUD domain and age of initiation of substance use as the negatively associated predictor of behavior pattern, psychiatric disorder, work adjustment domains and overall psychosocial problem score. Male and individuals with higher educational level were identified as the significant predictor of lower problem in psychiatric disorder and family system domain respectively. None of the variables were the significant predictors of school performance domain. It might be due to lack of statistical power as a result of small sample size. The school performance domain was used only by those respondents who used to go to school within the past 1 year.
The finding of this study has to be considered with reference to its limitations. The female substance users were very few in number and were from only one center. Thus caution should be used in generalizing the findings related to sex variable. Due to few numbers of respondents in some centers, stratified sampling technique was not applied and analysis was also performed by combining the respondents from different centers though there were some differences among the centers. It might have reduced the strength of the study. The other limitation is that the power analysis was not carried out; thus statistical power of the study may be open to question. Regarding frequency of substance use, the present study is based on number of times of substance use per day without much regard to quantity of substance use. This could have influenced the information regarding that variable. There is possibility of recall bias as data was collected within the reference period of 1 year.
Individuals with SUDs have more psychosocial problems and the problems are in different areas of life, so they need support and counseling for those areas. Injecting drug users, respondents initiating substance use early in life, using substances many times in a day and using both licit and illicit substances, are at greater risk of having higher psychosocial problems. Since substance use is linked to diverse areas of life and has been associated with various factors, treatment should be multifaceted in comparison to routine care only and should take into account of differences in socio-demographic and substance use related characteristics.
ANOVA, analysis of variance; BP, behavior pattern; DUSI-R, drug use screening inventory-revised; FS, family system; PD, psychiatric disorder; PPS, probability proportional to size; PR, peer relationship; SC, social competence; SD, standard deviation; SP, school performance; SPSS, statistical package for social sciences; SU, substance use; SUDs, substance use disorders; WA, work adjustment
World Health Organization. Global strategy to reduce the harmful use of alcohol. Geneva: World Health Organization; 2010. http://www.who.int/substance_abuse/alcstratenglishfinal.pdf?ua=1 Accessed 20 Mar 2015.
United Nations Office on Drugs and Crime. World Drug Report 2013. Vienna: United Nations Office on Drugs and Crime; 2013. https://www.unodc.org/unodc/secured/wdr/wdr2013/World_Drug_Report_2013.pdf Accessed 26 Mar 2015.
World Health Organization. The global burden of disease: 2004 update. Geneva: World Health Organization; 2008. http://www.who.int/healthinfo/global_burden_disease/GBD_report_2004update_full.pdf Accessed 3 Apr 2015.
Central Bureau of Statistics. Hard drug users in Nepal. Kathmandu: Ministry of Home Affairs; 2013.
Aytaclar S, Erkiran M, Kirisci L, Tarter R. Substance abuse and associated psychosocial risk factors among Turkish male adolescents. Addict Behav. 2003;28(8):1419–29.
De Micheli D, Formigoni ML. Screening of drug use in a teenage Brazilian sample using the Drug Use Screening Inventory (DUSI). Addict Behav. 2000;25(5):683–91.
Khalily MT. A comparison between the psycho-social characteristics of drug addicts and non-addicts. Pak J Psychol Res. 2001;16(3):113–28.
Garg N, Yates WR, Jones R, Zhou M, Williams S. Effect of gender, treatment site and psychiatric comorbidity on quality of life outcome in substance dependence. Am J Addict. 1999;8(1):44–54.
Lamichhane N, Thapa DK, Tamrakar BK. Quality of life in substance dependence syndrome. African J Health Sci. 2013;1(1):42–6.
Shantna K, Chaudhury S, Verma AN, Sing AR. Comorbid psychiatric disorders in substance dependence patients: A control study. Ind Psychiatry J. 2009;18(2):84–7.
World Health Organization. WHO expert committee on problems related to alcohol consumption. (WHO Technical Report Series, No. 944). Geneva: World Health Organization; 2007. http://www.who.int/substance_abuse/expert_committee_alcohol_trs944.pdf Accessed 22 Mar 2015.
Fergusson DM, Boden JM. Cannabis use and later life outcomes. Addiction. 2008;103(6):969–76.
Fergusson DM, Lynskey MT, Horwood LJ. The short-term consequences of early onset cannabis use. J Abnorm Child Psychol. 1996;24(4):499–512.
Wechsler H. Binge drinking on American college campuses: A new look at an old problem. Boston: Harvard School of Public Health; 1995.
Brook DW, Brook JS, Zhang C, Cohen P, Whiteman M. Drug use and the risk of major depressive disorder, alcohol dependence, and substance use disorders. Arch Gen Psychiatry. 2002;59(11):1039–44.
Horwood LJ, Fergusson DM, Hayatbakhsh MR, Najman JM, Coffey C, Patton GC, et al. Cannabis use and educational achievement: findings from three Australasian cohort studies. Drug Alcohol Depend. 2010;110(3):247–53.
Prescott CA, Kendler KS. Age at first drink and risk for alcoholism: a noncausal association. Alcohol Clin Exp Res. 1999;23(1):101–7.
Robbins C. Sex differences in psychosocial consequences of alcohol and drug abuse. J Health Soc Behav. 1989;30(1):117–30.
Pradhan SN, Sharma SC, Shrestha MR, Shrestha S. A study of depression among patients of substance use disorder. J Kathmandu Med Coll. 2012;1(2):96–9.
Rehm J, Mathers C, Popova S, Thavorncharoensap M, Teerawattananon Y, Patra J. Global burden of disease and injury and economic cost attributable to alcohol use and alcohol-use disorders. Lancet. 2009;373(9682):2223–33.
Peters RH, Strozier AL, Murrin MR, Kearns WD. Treatment of substance-abusing jail inmates. Examination of gender differences. J Subst Abuse Treat. 1997;14(4):339–49.
Galen LW, Brower KJ, Gillespie BW, Zucker RA. Sociopathy, gender, and treatment outcome among outpatient substance abusers. Drug Alcohol Depend. 2000;61(1):23–33.
Grella CE. Effects of gender and diagnosis on addiction history, treatment utilization, and psychosocial functioning among a dually-diagnosed sample in drug treatment. J Psychoactive Drugs. 2003;35 Suppl 1:169–79.
Tarter RE, Kirisci L. The Drug Use Screening Inventory for adults: psychometric structure and discriminative sensitivity. Am J Drug Alcohol Abuse. 1997;23(2):207–19.
Tarter RE, Kirisci L, Mezzich A, Patton D. Multivariate Comparison of Male and Female Adolescent Substance Abusers with Accompanying Legal Problems. J Crim Justice. 2011;39(3):207–11.
Degenhardt L, Hall W. Extent of illicit drug use and dependence, and their contribution to the global burden of disease. Lancet. 2012;379(9810):55–70.
Nordfjærn T. Do severity levels of substance use relate to self reported variations in psychosocial distress? J Subst Use. 2011;16(6):422–38. doi:10.3109/14659891.2010.495444.
Grant BF. Comorbidity between DSM-IV drug use disorders and major depression: results of a national survey of adults. J Subst Abuse. 1995;7(4):481–97.
Dobson K. Exploring the health issues of hidden homeless IV drug users in a mid-sized Canadian community. University of Windsor Canada. 2012. http://scholar.uwindsor.ca/cgi/viewcontent.cgi?article=1219&context=etd Accessed 24 May 2015
De Maeyer J. Quality of life among opiate-dependent individuals after starting methadone maintenance treatment. Orthopedagogische Reeks Gent. [Ghent, Belgium]: Ghent University. Faculty of Psychology and Educational Sciences; 2010. http://hdl.handle.net/1854/LU-1144386.
Kirisci L, Tarter RE, Hsu TC. Fitting a two-parameter logistic item response model to clarify the psychometric properties of the Drug Use Screening Inventory for adolescent alcohol and drug abusers. Alcohol Clin Exp Res. 1994;18(6):1335–41.
Fergusson DM, Horwood LJ, Swain-Campbell N. Cannabis use and psychosocial adjustment in adolescence and young adulthood. Addiction. 2002;97(9):1123–35.
Ilomäki R. Substance use disorders in adolescence: Comorbidity, temporality of onset and sociodemographic background. Acta Universitatis Ouluensis. 2012. http://herkules.oulu.fi/isbn9789514299230/isbn9789514299230.pdf Accessed 3 Apr 2014
Grant BF, Dawson DA. Age at onset of alcohol use and its association with DSM-IV alcohol abuse and dependence: results from the National Longitudinal Alcohol Epidemiologic Survey. J Subst Abuse. 1997;9:103–10.
Dennis M, Babor TF, Roebuck MC, Donaldson J. Changing the focus: the case for recognizing and treating cannabis use disorders. Addiction. 2002;97:4–15.
Fergusson DM, Horwood LJ. Early onset cannabis use and psychosocial adjustment in young adults. Addiction. 1997;92(3):279–96.
We would like to thank Institutional Review Board of Institute of Medicine for accepting our proposal and providing ethical clearance. We acknowledge drug treatment and rehabilitation centers for helping us with setting to conduct this study. Similarly, our sincere gratitude goes to Dr. Steve Weatherbee, President of eCenter Research for providing the tool, Drug Use Screening Inventory-Revised. We owe our vote of thanks to all the individuals who participated in this study.
Availability of data and supporting materials
The dataset supporting the conclusions of this article is included within the article.
Ms. AP was involved with the design of the study, and wrote the first draft of the manuscript. Ms. AP and SG collected data and involved with data analysis. Mr. AP performed statistical analysis. CS, SG and Mr. AP revised the manuscript for important intellectual content. All authors read, edited and approved the final manuscript.
The authors declare that they have no competing interests.
Consent to publication
Ethics approval and consent to participate
Before the data collection, an ethical clearance was taken from the Institutional Review Board of Tribhuvan University, Institute of Medicine and formal permission was obtained from the drug prevention and rehabilitation centers. A written informed consent was taken from the individuals with SUDs. They were also informed about the purpose of the study, their voluntariness in participation and no any foreseeable risk and harm in the study.