Table 1

Sociodemographic characteristics at baseline testing and 12-month follow-up

Baseline testing12-month follow-up
Outcome variableOverall (n=40)Meth group (n=10)Meth-cann group (n=10)Control group (n=20)Overall (n=19)Meth group (n=9)Control group (n=10)
Test age (in months)188.10 (15.89)187.90 (16.35)189.80 (15.75)187.35 (16.48)198.53 (16.83)198.22 (17.92)198.80 (16.77)
Sex
 Female: male25:157:37:311:913:66:37:3
First language
 English: Afrikaans7:331:91:95:152:171:81:9
Education (in years)8.10 (1.32)7.90 (1.45)8.00 (1.56)8.25 (1.16)8.74 (1.28)8.44 (1.33)9.00 (1.25)
Repeated grades0.38 (0.59)0.40 (0.52)0.70 (0.82)0.20 (0.41)0.63 (0.76)0.78 (0.67)0.50 (0.85)
Annual income (ZAR)*56 370 (13 604)59 389 (14 384)54 451 (18 906)55 819 (10 272)56 987 (15 225)59 095 (15 225)55 090 (11 479)
  • Means are presented with SDs in parentheses.

  • *Presented as a proxy measure for socio-economic status.

  • Meth-cann group, Methamphetamine and cannabis group; Meth group, Methamphetamine only group.