[1] Casey BJ, Getz S, Galvan A. The adolescent brain. Developmental review 2008;28:62-77.
[2] World Health Organization. Recognizing adolescence. Available at: http://apps.who.int/adolescent/second-decade/section2/page1/recognizing-adolescence.html Accessed August 14 2017.
[3] Mokdad AH, Forouzanfar MH, Daoud F, et al. Global burden of diseases, injuries, and risk factors for young people's health during 1990–2013: a systematic analysis for the Global Burden of Disease Study 2013. The Lancet 2016;387:2383-2401.
[4] DuRant RH, Smith JA, Kreiter SR, et al. The Relationship Between Early Age of Onset of Initial Substance Use and Engaging in Multiple Health Risk Behaviors Among Young Adolescents. JAMA Pediatrics 1999;153:286-291.
[5] Ellickson PL, Hays RD, Bell RM. Stepping through the drug use sequence: longitudinal scalogram analysis of initiation and regular use. Journal of abnormal psychology 1992;101:441-451.
[6] Ellickson PL, Tucker JS, Klein DJ. High-risk behaviors associated with early smoking: results from a 5-year follow-up. Journal of Adolescent Health 2001;28:465-473.
[7] Mathers M, Toumbourou JW, Catalano RF, et al. Consequences of youth tobacco use: a review of prospective behavioural studies. Addiction 2006;101:948-958.
[8] Chou SP, Pickering RP. Early onset of drinking as a risk factor for lifetime alcohol-related problems. British journal of addiction 1992;87:1199-1204.
[9] Gonzalez GM. Early onset of drinking as a predictor of alcohol consumption and alcohol-related problems in college. Journal of drug education 1989;19:225-230.
[10] Gruber E, DiClemente RJ, Anderson MM, et al. Early drinking onset and its association with alcohol use and problem behavior in late adolescence. Prev Med 1996;25:293-300.
[11] Kandel D, Yamaguchi K. From beer to crack: developmental patterns of drug involvement. American journal of public health 1993;83:851-855.
[12] Yu J, Williford WR. The age of alcohol onset and alcohol, cigarette, and marijuana use patterns: an analysis of drug use progression of young adults in New York State. The International journal of the addictions 1992;27:1313-1323.
[13] Boily M-C, Baggaley RF, Wang L, et al. Heterosexual risk of HIV-1 infection per sexual act: systematic review and meta-analysis of observational studies. The Lancet infectious diseases 2009;9:118-129.
[14] Reddy S, James S, Sewpaul R, et al. Umthente Uhlaba Usamila – The South African Youth Risk Behaviour Survey 2008. Cape Town: South African Medical Research Council; 2010.
[15] Dodd LJ, Al-Nakeeb Y, Nevill A, et al. Lifestyle risk factors of students: A cluster analytical approach. Preventive Medicine 2010;51:73-77.
[16] Colder CR, Campbell RT, Ruel E, et al. A finite mixture model of growth trajectories of adolescent alcohol use: Predictors and consequences. Journal of consulting and clinical psychology 2002;70:976.
[17] Colder CR, Mehta P, Balanda K, et al. Identifying trajectories of adolescent smoking: an application of latent growth mixture modeling. Health Psychology 2001;20:127.
[18] Connell CM, Gilreath TD, Hansen NB. A Multiprocess Latent Class Analysis of the Co-Occurrence of Substance Use and Sexual Risk Behavior Among Adolescents. Journal of Studies on Alcohol and Drugs 2009;70:943-951.
[19] van Nieuwenhuijzen M, Junger M, Velderman MK, et al. Clustering of health-compromising behavior and delinquency in adolescents and adults in the Dutch population. Preventive Medicine 2009;48:572-578.
[20] UN Department of Social and Economic Aff airs PD. World population prospects: highlights of the 2008 revision. Working Paper No ESA/P/WP210. New York, NY: United Nations, 2009.
[21] Norris SA, Richter LM, Fleetwood SA. Panel studies in developing countries: case analysis of sample attrition over the past 16 years within the birth to twenty cohort in Johannesburg, South Africa. Journal of International Development: The Journal of the Development Studies Association 2007;19:1143-1150.
[22] Centers for Disease Control and Prevention. Youth Risk Behavior Surveillance System (YRBSS). Available at: https://www.cdc.gov/healthyyouth/data/yrbs/index.htm Accessed Dec 11 2019.
[23] Reddy S, Panday S, Swart D, et al. Umthenthe uhlaba usamila–The South African youth risk behaviour survey 2002. Cape Town: South African Medical Research Council; 2003.
[24] Charrad M, Ghazzali N, Boiteau V, et al. NbClust: An R Package for Determining the Relevant Number of Clusters in a Data Set. Journal of Statistical Software 2014;61:1-36.
[25] Maechler M, Rousseeuw P, Struyf A, et al. cluster: Cluster Analysis Basics and Extensions. R package version 2.0.8, 2019.
[26] R Core Team. R: A language and environment for statistical computing. Vienna, Austria: R Foundation for Statistical Computing 2019.
[27] Brener ND, Billy JO, Grady WR. Assessment of factors affecting the validity of self-reported health-risk behavior among adolescents: evidence from the scientific literature. Journal of adolescent health 2003;33:436-457.
[28] Zweig JM, Lindberg LD, McGinley KA. Adolescent Health Risk Profiles: The Co-Occurrence of Health Risks among Females and Males. Journal of Youth and Adolescence 2001;30:707-728.
[29] de Winter AF, Visser L, Verhulst FC, et al. Longitudinal patterns and predictors of multiple health risk behaviors among adolescents: The TRAILS study. Prev Med 2016;84:76-82.
[30] Beauclair R, Meng F, Deprez N, et al. Evaluating audio computer assisted self-interviews in urban South African communities: evidence for good suitability and reduced social desirability bias of a cross-sectional survey on sexual behaviour. BMC medical research methodology 2013;13:11.
[31] Dolezal C, Marhefka SL, Santamaria EK, et al. A comparison of audio computer-assisted self-interviews to face-to-face interviews of sexual behavior among perinatally HIV-exposed youth. Archives of sexual behavior 2012;41:401-410.
[32] Metzger DS, Koblin B, Turner C, et al. Randomized controlled trial of audio computer-assisted self-interviewing: utility and acceptability in longitudinal studies. HIVNET Vaccine Preparedness Study Protocol Team. American journal of epidemiology 2000;152:99-106.
[33] Del Boca FK, Darkes J. The validity of self-reports of alcohol consumption: state of the science and challenges for research. Addiction 2003;98 Suppl 2:1-12.
[34] Smith GT, McCarthy DM, Goldman MS. Self-reported drinking and alcohol-related problems among early adolescents: dimensionality and validity over 24 months. Journal of studies on alcohol 1995;56:383-394.
[35] Strecher VJ, Becker MH, Clark NM, et al. Using patients' descriptions of alcohol consumption, diet, medication compliance, and cigarette smoking: the validity of self-reports in research and practice. Journal of general internal medicine 1989;4:160-166.
[36] Reddy S, James S, Sewpaul R, et al. Umthente uhlaba usamila: The 3rd South African national youth risk behaviour survey 2011; 2013.