All study procedures were approved by the Committee for Human Research of Stellenbosch University. After eligibility was established, written consent from parents and written assent from participants was obtained. Participants were transported from their homes or schools to the testing site. After physical and psychiatric screening, urine analysis and breathalyzer testing, the subjects completed demographic self-report questionnaires and neuropsychological testing (approximately 3 hours). Tests were individually administered by a clinical psychologist (HLF) in the participants’ preferred language. Participants were provided with meals and refreshments, and at the conclusion of the testing session were compensated for their time with gift vouchers. Confidentiality of all study information was maintained with the exception of statutory reporting requirements in newly-identified or ongoing threats to the safety of minor participants. Two of the 54 recruited subjects were excluded as screen failures: one was diagnosed with current posttraumatic stress disorder and the other tested positive for cannabis use.
