1 THE HASI several self-report questions MINUTES TO ADMINISTER CONSISTS OF backwards spelling a “join the dots” puzzle a clock drawing sub-test

2 Table 1 Gender and age of participants GenderUnder 18Over 18Total Male % % % Female % % % TOTAL % % %

3 Prevalence of intellectual disability in the study population n SS<70 on KBIT or VABS n Total Sample: –17.4% below 70 on KBIT –27.8% on the VABS n In under-18 group: –16.2% below 70 on KBIT –28.0% on VABS n No significant difference between juvenile and adult offenders

4 Table 2 Standard scores for indigenous and non-indigenous groups Test Indigenous Status NMean Standard Deviation KBIT Composite SS Not indigenous Indigenous * Vineland Composite SS Not indigenous Indigenous ** * p<.002 **p<.005

5 Sensitivity Specificity Figure 1Using the HASI to screen for intellectual disability - total sample Sensitivity Specificity Area under ROC curve

6 Sensitivity Specificity HASI VABS SS Figure 2Comparison of HASI and VABS in predicting KBIT results - total sample

7 Sensitivity Specificity HASI KBIT TOT SS Figure 3Comparison of HASI and KBIT in predicting VABS

8 Sensitivity Specificity HASI VABS SS Figure 4Comparison of HASI and VABS in predicting KBIT in indigenous sample

9 Sensitivity Specificity HASI KBIT TOT SS Figure 5Comparison of HASI and KBIT in predicting VABS - indigenous group

10 Correlations between the HASI, and KBIT and VABS n Correlations were significant (0.01 or 0.05) for - –Adult males –Adult females –Under 18s –Indigenous, including Aboriginal, Torres Strait Islander, Maori and Pacific Islander –Aboriginal and Torres Strait Islander (ATSI) only - adults and juveniles n The only non-significant correlation was between HASI and VABS scores for juvenile ATSI

11 Future directions n Further development to increase culture-fairness n Trial in hospital emergency rooms, assessing competence n Possible use by social security agencies n Possible use in adolescent mental health agencies –“The overwhelming over-representation in corrective services and juvenile justice is a powerful argument for the need for increased investment in early childhood intervention” –(NSW Parliamentary Standing Committee on Law and Justice, 1999)